Google got sued by Sonos and had to disable this and other features.
More info here:
https://www.googlenestcommunity.com/t5/Blog/Upcoming-Speaker-Group-changes/bc-p/77851#M623
Anyone know a good lawyer for a class action suit?
So you got sued by Sonos and we pay the price? Either get some better
lawyers and win the suit or pay Sonos a royalty or start issuing refunds
to customers.