But these sham community engagement exercises piss me off

That's Google for you: they've been doing self-serving open-source for decades.

For instance: they open-sourced Android. That helped Android become the dominant platform and Google capture the cellphone market. Since then, Google has been slowly moving their stuff away from the open-source AOSP and into their proprietary stack, introduced proprietary features that are almost compulsory for a practical, working Android system like Play Protect, and are actively killing deGoogled ROMs.

There's only one thing to keep in mind with Google: if they do something, it's not in your interest, and they know how to play long games. Anything they do will be used against you some day.