I wonder what their costs are like? I'm not familiar with all the features of Bitwarden in particular, but a password management service is basically E2EE cloud storage for very tiny files, a simple account system, and then a bunch of clients.

Building and maintaining clients for all operating systems and browsers probably costs the most, but it can likely be done by 1 or 2 full time engineers.

Or am I completely underestimating the complexity of something like this?