The Sims 4 is gold on ProtonDB, so it should run just fine. Check out some of the comments in ProtonDB about running the game, if not purchased through Steam.
Edit: Start out with Linux Mint. It’s very user friendly.
You can do it with videos that’s under the CC license.
I have myself setup a mirror of the official Guild Wars 2 channel, so I can watch their videos on PeerTube. I haven’t asked, but I don’t think they have a problem with the free advertisement.
Best people can do is convince creators on YouTube to also post their content to PeerTube, as well as engage with their audience on PeerTube.
It's a one time payment, to help fund the development.