An intriguing question, closely related to Michael's post on adverts appearing on his TV, and maybe sent to other devices on his network.
In times past, technology was brainless. Telephones, TVs, Radios, Fridges, Machine Tools, Cars, Aircraft and Toasters were isolated, and, when needed, getting machines to communicate required costly special interface technology.
Turns out interconnectivity is a valuable feature, the modern equivalent of Whitworth standardising threads. It's not only anti-aircraft systems that benefit from coupling sensors, computers and servos together, it's systems in general. It allows TV viewers to select the programme they want to watch now rather than wait for it to appear on a schedule. Whilst people of my age tend to watch broadcast TV via an aerial, anyone under 50 is likely to be connected to a narrowcast service, and streaming media on demand.
Under the bonnet there's little difference between a Smart Phone and a Smart TV, and pretty much anything with a display, like a DRO, could join the club. As digital technology is standards based, lego-built, it could be cheaper to program a small Smart TV to be a DRO than to design one: most of the functionality is in software. This is why Digital Toaster are appearing; they don't cost much to make, and might be useful.
Communications and compute power are cheap enough to be universally on. Once a washing machine's capability was limited by it's mechanical controller. Today, microcontrollers come with Bluetooth, Wifi and a shower of other smart features built in. New washing machines can be remote controlled, report faults, and cooperate with energy management regimes. Or anything else the designer wants.
Though it leaves me cold, there's much benefit in this to mankind, and the young don't suffer the same culture shock as me because they are immersed in it I desperately read the manual whilst my children just accept it works and press a few buttons. They wonder why I have to make technology difficult by trying to understand it!
A massive downside to all this sharing is devices that previously didn't have security or privacy implications are now riddled with them. No need to agree Terms and Conditions when installing a basic TV because it's too stupid to do anything unwanted. But there's every need to look at the Ts&Cs and configuration settings of a Smart TV, because the thing will initially obey the sellers instructions, possibly detecting speech like Alexa, rather than enforcing your privacy. Several third parties are involved. And, as a Smart TV is a network connected computer, it might be hacked, for example by an outsider turning on the webcam and watching you.
Living in a democracy I'm not too concerned about the state monitoring what I'm up to. Privacy intrusions are much more worrying, because who collects information and what it's used for is almost completely out of control. Private information is bought and sold internationally and it can be collated, cross-referenced, sorted, associated, and analysed in a multitude of ways. Not difficult to identify individuals from supposedly anonymous data-sets. Most data collection is innocuously used to target advertising, but bear in mind organised crime can buy the same data to meet their needs.
No need for paranoia, but cause for concern. I prefer not to be subjected to 'psychoanalytic profiling' by anyone. So I take care to reduce leakage of private information by not sharing it willy-nilly. My computers run on the principle of least privilege (not doing ordinary work as admin, not running Public services, and restricting accounts to only what they need). Settings are altered to refuse cookies, location information, analytics and anything else than can be turned off. Router settings are clamped. I often browse in Private window mode, and I prefer Linux to Windows because it's a harder target and provides more control. I don't share passwords or usernames between different accounts and the passwords are a near random mix of alpha-numerics and punctuation at least 9 characters long. Software is up-to-date and suspicious activity investigated. Ad blocking, website blacklisting, and anti-tracking software is installed. Unfortunately this level of control may not be possible on a Smart device aimed at folk who just expect stuff to work. My BT Router is a bit like that: fairly good, except it doesn't allow access to some of the deeper controls available, probably because customers would mess them up.
A big problem is strong security is a pain to manage and it's so much easier just to unlock everything so people don't have to worry about admin permissions. Most of us rant at minor inconveniences, never read the instructions, and we don't care one jot about security until we step in it!
I haven't felt it's necessary to set up a Virtual Private Network or any of the other elaborate security precautions available, but I think my next TV will have be crimped by Pi-hole, or similar. Technology is double-edged!
Dave