It's doing completely pathological shit, like "hey why don't I run random search queries on the git repositories for random authors multiple times per second?"
I can't stress enough how all I've had to do with gitweb is upgrade the debian packages over the past 15 years, and now I have to manually block facebook crawlers because they're so bad. Since midnight, 200k facebook hits, and 30k non-facebook hits. #FuckMeta