A known leaker and SteamVR data miner named Bradley Lynch reports that Valve is working on an Android emulator. Lynch has spotted five apps in a package on SteamDB, with two of them displaying new artwork that references Waydroid, an open-source and free Android emulator.
In the end you are still at the mercy of their shareholders and their core mission of EEE over end-user empowerment. Every thing they build is designed with lock-in and obfuscation to protect themselves.