With some minor tweaks this becomes an interesting service, namely Google funds a bunch of AAA games that are exclusive to Stadia, for $10/mo you get a huge library of games and don't have to pay more for anything, and they have ports of MP and party games like Fortnite, APEX, Just Dance, Monopoly, Mario Party clone, Smash Bros, Wii Sports, etc which means you can take your controller and a dongle to a friends house and 3-4 of you can play attached to various TVs in a semi-lan party without having to drag around PCs or consoles. Plus a lot more work to make it work really well with phones and tablets.
But virtually none of that is in at launch. They are launching at a $140 buy in, PLUS $10/mo for just Destiny 2 and NOTHING else, PLUS you have to buy whatever library of games they release and its all 1-2+ year old junk right now - Tomb Raider, Assassins Creed Odyssey, etc. You are literally paying to be a beta tester so they can continue to tweak the service.
I do like it though because it will force Microsoft to be better, and who the fuck knows what Sony is doing. We'll find out more sat or sunday about Microsoft's xCloud but I have to imagine thats going to be the far, far superior service right now for most people who want to play more than 2 hours of games a month. Don't forget Apple's gaming thing too, its basically the same thing except it runs basically mobile games but it comes in at $10/mo for their entire games library with guaranteed no microtransactions in any game.