its not the same at all, in netflix when a new series or movie comes along you can see it as long as your subscribed to netflix, on stadia you pay for the service and then you pay for the games as well, the stadia subscription so far only gives you free destiny 2 , everything else you need to buy and keep paying the subscription also, so double pay, nothing like netflix at all lol.
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no you always need to pay subscription and then the game, google wont let you stream without both, i guess in the long run they will decrease the games individual price or even made them free like destiny 2, but right now you pay to stream and pay for every single game.