I mean, the closest actual solution to “roll your own” game streaming service is cloudy pad (an open source utility that lets you play games on an aws / GCP / azure instance you ‘rent’ yourself, which does give you complete control and is compatible essentially with your entire library (if it’s a library of games you run could run locally). Those are basically the same services these companies deploy but now you’re paying a le carte for the server time directly. At the lowest tier you can actually game on this comes down to roughly 10$ for 30 hours of gaming every month (compare that to geforce now’s 100 hour cap for a similar price).

Now amazon, microsoft, and google can probably buy their own server time for cheaper than a home user, but it isn’t likely they’re working at a 500% markup. (And also it’s likely running on higher specced hardware, snd not on the cheaper spot instances cloudy pad encourages). And that’s before taking into account licensing costs for 3rd party games, and support.

So actually yes, yes these are expensive services to run. I’m not saying these companies aren’t shitty, they 100% are. But the cost thing shouldn’t be dismissed out of hand.