That's not what's happening here. They're making their app closed source with closed source features. Time to find a new provider.
Everything will get chipped away piece by piece. It’s been happening continuously for well over a decade at this point and everyone should understand the strategy by now.
At least with bitwarden, if the value they're trying to extract becomes more than the product is worth, in terms of real cost, lockin or transparency, at least the code is open now and for the foreseeable future. And when it comes time to fork it, AI will make it easier for the future maintainer(s) to keep the fork alive at minimal expense.
Point is, if need be, the open source version could be forked and carried forward by someone else, using the public code as a definitive spec for any missing functionality.