In the US at least (don't know about Italy), TV is very rarely streamed over the Internet. Most people have a cable / set-top box that does the descrambling and then send a (HDCP protected) video stream to the TV.
Because commercial TVs are trusted devices that have the key to decrypt the HDCP stream, if a TV had a feature to record and rewind video, it would work just fine. Widevine isn't related because that's only used (AFAIK) for Internet streaming.
Not sure what you mean; streaming TV in the US is booming with YT TV reportedly having 5 million subscribers, Hulu live TV at 4.1 million, Sling at 2.2 million, and Fubo at 1 million.[0] That's 12 million american households, so between 5% and 10% of the adult population (depending on how many subscribers you think are married).
There are more than 50 million cable TV subscribers alone, though. And just over 10% of television households rely on broadcast TV exclusively. My point wasn't that streaming TV subscribers don't exist, it was just that the OP almost certainly meant recording traditional cable or broadcast TV when they said "tv recording". That's why I was confused by your reference to widevine.
Because commercial TVs are trusted devices that have the key to decrypt the HDCP stream, if a TV had a feature to record and rewind video, it would work just fine. Widevine isn't related because that's only used (AFAIK) for Internet streaming.