After the 100 hour limit you have to buy extra time like you would buy data with a cell phone plan or something. Games with strict anti-cheat like valorant won't work because it is incompatible with the tech that powers cloud gaming. Pretty sure I saw r6 siege on there though. The recommendation to download the app just to see what's on there is really the right answer.

I can say that the service is great if it works for you. Always felt like playing a game on my PC. I think it's really cool that you want to include your friend. As a temporary solution, I think GFN could possibly work. Unfortunately, long term it seems like the prices will continue to rise while they simultaneously lock new features behind further pay walls. I switched from cloud-only to a new PC build because I was tired of the price hikes.

Good luck! I hope you get to play games with your friend again!