This appears to be the main thread you may want to read:

Just read that, I’m reselling all my sonos speakers.

Bad move from SONOS CEO, they are going to go bankrput. It’s a shame, such a great company with lots of talented developers ruined by the ego of a CEO.

From what I understand, it’s a decision made by Google, not Sonos, by changing the ground rules on ‘newer’ devices having the option. But that’s from the outside, looking in, I certainly wasn’t part of the decision.