Google Poly looks like a fun experiment that unfortunately didn't pan out to their expectations. Google APIs/GCP have paying users that businesses depend on. It wouldn't be fair to have them in the same room.
I was about to ask if TiltBrush relied on this. Thanks for confirming. It's hard to buy anything made by Google that hasn't been around for close to a decade, unless you don't care whether or not that product stays around.
I mean, it's a language and open source. If the community really hates the direction Google takes it, they can fork it and support whatever features they want.
I mean, that's what you get when the internal metrics are skewed towards shipping new products, paying no attention to maintaining or improving existing ones.