> to the fact that bitbucket.org-the-website is just the Atlassian-hosted installation of BitBucket-the-Atlassian-product, which you can also self-host and self-administrate.
Nope. They're completely separate things.
The hosted one they bought, and does mercurial too.
The self hosted one is what used to be called stash, and is git only afaik.
It is payware, but reasonably affordable ($10/10 users, usually).
I've seen companies squeeze some (probably contract-breaching) huge numbers of users out of the very small plans of Atlassian software, as well, usually via insane multiple-people-using-same-account editing conventions.