I hate to break it to you but since you keep bringing it up.
You don't own your game even if you buy a physical disc. On steam, or any pc digital distribution platform you are paying for a license to play said game. You are always effectively renting the game. Same goes for consoles. In this regard you are getting the same deal on Stadia.
Another thing you seem adamant to impress on anyone who dares suggest they like Stadia is that if the other streaming platforms go down then you still have your pc games available on other services. This is true, but one of the primary benefits of a streaming service is that you no longer need expensive hardware. If a user decides to use only streaming services then they are unlikely to maintain a decent gaming rig. So over time this becomes a moot point. If you have and maintain a good gaming pc then why would you even bother with ANY streaming platform as they will always be somewhat inferior.
You don't own your game even if you buy a physical disc. On steam, or any pc digital distribution platform you are paying for a license to play said game. You are always effectively renting the game. Same goes for consoles. In this regard you are getting the same deal on Stadia.
Another thing you seem adamant to impress on anyone who dares suggest they like Stadia is that if the other streaming platforms go down then you still have your pc games available on other services. This is true, but one of the primary benefits of a streaming service is that you no longer need expensive hardware. If a user decides to use only streaming services then they are unlikely to maintain a decent gaming rig. So over time this becomes a moot point. If you have and maintain a good gaming pc then why would you even bother with ANY streaming platform as they will always be somewhat inferior.