Silly idea.
I would rather have a right to unlock. Make it law that Sony can't prevent alternatives OS installation. Then when you get Arch running on a PS5 you can install Steam on top
Even when the PS3 supported Linux, Sony didn’t give OtherOS full access to the GPU. So I doubt you’d get any benefit running Steam on a hypothetical Linux-powered PS5.
This would help but doesn’t solve the problem these people want solved (Sony being able to take away games after purchase and reselling games being impossible because the games are all digital)