Steam works very well on Linux. There is a setting in Steam to enable 'proton' for all games - this allows you to play Windows games on Linux without having to do anything else. It has worked flawlessly for every game I've tried.
As for your movies thing, I don't know. I deliberately avoid software that automatically searches and catalogues stuff on my computer. So I'm not sure how easy it is to do what you are asking for. It's something that I'd avoid rather than seek out.
The "and more" is the worrying part. They're telling us that some of the things they are adding are not 'features'. So then what are they?
Ads, probably. That's the trend these days. More and more ads, in everything, everywhere - just really probing the limits of tolerability.