Not quite. I coincidentally signed up for a GitLab account that very day, at that very time period, to make a minor change to someone else's project. I (1) set up my account, (2) forked their project, (3) made the change, and (4) issued a pull request. Came back the next day and none of that was there, including my forked git repo. I had to do it all over again, and it was clear it was a clean wipeout of everything, because I was allowed to re-register with the exact same userid, etc. I know that is a rare-snowflake event, but the fact I had a repo and had even sent a pull request from it shows they did, in fact, lose some data in git itself.