These days the standard is to create an API Doc out of a OpenAPI document generated from the code itself. Someone will probably contribute to it at some point.

Well, in the case of Bitwarden the client is open source so it can actually be reviewed whether or not it is actually encrypted. No need to trust anyone.

The issue with replacement for YouTube is that it needs to be both sustainable AND pay the professional content creator. This is not an easy task and the main reason why alternatives are usually running behind a subscription service.