It’s actually very easy. Don’t use your TV as anything but a display. Don’t connect it to the internet ever.
If you need to watch content on it get an appropriate device. If you want to watch BluRays buy a BluRay player. If you want to do streaming buy a streaming device at a price point and privacy level to your liking. Yes the streaming devices collect some data too but they don’t have mics and cameras and they can’t tell corporations and the government the contents of the vacation photo slide show off your laptop which you plugged in. Also you can in future often neuter many of the more expensive streaming devices and if you get sick of the streaming device you have, you can just buy a different one and sell the old one.
As to librelec and “sucking”. If you’re trying to do yo-ho stuff with free streaming sites and services it isn’t going to be great. Frankly if you want some quality and good experience either pay for a commercial streaming service (or a good IPTV one*) or invest in learning how to host your own content with an Arr stack. This used to be a lot cheaper but AI has ruined everything. Nothing we can do about that.
*yeah good ones are hard to find and one should never pay ahead as many of them vanish suddenly.







Yes. Certs can expire after whatever time the issuer wants to set for them. That could be six months or 20 years. Some infrastructure has limits on max and min lengths (more max than min usually) but not all and there are best practices as well.
More importantly the certs could have been five years old by the time this person got the TV for a total age of 8 years.