Konstantin Ryabitsev has written a blog post with hard numbers about the impact of AI crawlers on the Linux kernel
repositories at git.kernel.org: Today, git.kernel.org receives about 6M daily requests demanding to see random commits. Of these, 66% are still immediately batted away with the Anubis challenge, but 33% are now solving the math and getting through to the main site — because apparently what we have to offer is worth spending a ton of cycles to calculate the Anubis challenge.
It's impossible to tell with certainty which of these are bots and which are real humans — but chances are, if it's asking for an old commit in a random old fork, it's probably not a real developer trying to do their work.
With a bunch of generous assumptions, legitimate requests are only about 2% of git.kernel.org traffic — everything else are scrapers.