Oh I have had a plex and then jellyfin server for almost 15 years. Yarr mateys

Don't worry your TV will just hijack the HDMI signal to inject its own ads

Honestly the best thing about FOSS is that money isn't driving all the decisions. Most open-source projects are built because the dev just wants to build something cool or useful, or they're trying to solve specific problems. Most individual devs don't really care if their user count goes up every quarter.
Personally I've been maintaining a chrome extension for about 10 years, and it's sat happily with about 7000 users that entire time. I built it because I wanted to use it, and I've declined several offers to buy the extension and monetize it.

I mean the concept is pretty simple, all they have to do is make whatever the content it is not play without the verification.

Now I do have to say, it does come down to what is the system we do want? We can agree we don't want intrusive ads. We can say that the paid for services are too expensive. But at the end of the day when we refuse to pay for the content, and then bypass the ads, we do leave content creation in a rough spot. We've kind of reached a point where we need a new system. Yet all we seem to do is try and find ways to break the existing one.