I know they exist. I think you’re missing what I’m saying.
Bitwarden is fully free and self hostable. That is how I use it. Bitwarden needs a self hosted webserver. KeePass can use only a cloud provider or self hosted cloud storage and also set up a web vault.
With Bitwarden, if you don’t want that hassle you can use their webvault they host. You cannot do that with keepass. That is what costs the $10/year.
Point is, both are good software that do things a bit differently. I liked KeePass, but I found Bitwarden to do what I wanted better, which was easily sync my passwords across devices without the hassle of self hosting something like Nextcloud. A quick docker container and I’m good.
Maybe some people are fine with keepass and something like Dropbox for sync. And maybe others don’t want to use a public cloud server but also don’t know how or want to host their own instance of a a password manager or cloud server. So they can use something like Bitwarden’s webvault instead, which is free except for TOTP.