As soon as they break compatibility with the official clients, it becomes much tougher. Even though the current versions can be forked, the whole system is set up to work against any kind of grassroots effort to maintain an open source version.

Apple and Google being the gatekeepers for all mobile app distribution is a real pain point. Without the clout of a big brand name the risk of being unable to distribute apps goes up.

How long after a public sale will Bitwarden clients keep compatible with Vaultwarden? The new owners could put a check in all clients on the first day of ownership if they wanted, and Vaultwarden would immediately be obselete and useless.