While Stadia did cause them to do more work on WebRTC (AFAIK mostly with latency), their WebRTC efforts--and you are referencing high-level stuff, not low-level

While Stadia did cause them to do more work on WebRTC (AFAIK mostly with latency), their WebRTC efforts--and you are referencing high-level stuff, not low-level Stadia-specific details--was mostly driven by Google Hangouts, not Stadia.