Changed by informing in advance. If they change it to scrape your data to sell it to advertisers or someone, drop their service.

As rumbefrog said, not exactly an option if they're the biggest/only game in town or if no one else has a feature you absolutely rely on.

Easier said than done, vendor lock-in is costly to move from.

Sure, they could try adding “your data is our data” on the renewal of a few million dollar enterprise contract and see how that goes - probably a redline with a nasty Zoom call attached. They could rug-pull this on free and small business users to a degree, but I don’t even see how it would be worth it. It’s such a small proportion of their traffic, and the fact that this is even a thing on their platform would scare away regulated customers for sure.