I tried to use Stadia, as a long-time paid user with a gsuite account I use for my personal account, they wouldn't let me as an "enterprise user". I spit on their future grave then, and I spit on it now - it was destined to die. Steam actually embraces linux with Proton to make windows games work. As a full-time linux user for ~20 years, bless Valve's soul.
Linux is what killed stadia. They have to get developers onboard to port their games. Getting big games ported cost them millions upon millions. If they embraced windows, they would have a huge library just like Geforce now. Linux killed stadia imo.
Surely, they just used proton, right? Source code is here: