This is the real answer to this. They know they can coordinate with the Copilot team to change or remove API usage much quicker than third party extensions.

I bet they'd love if there were a way to have trusted testers that they could _force_ to make timely updates like they likely can with Copilot.

Maybe they should look into Chrome's Origin Trial system and make time-limited API tokens so that extension developers know that features relying on experimental APIs will break, even if the API itself doesn't. That seems to keep causal usage at bay and make sure that trial developers stay on top of things.