On my forge, I mirror some large repos that I use for CI jobs so I'm not putting unfair load on the upstream project's repos. Those are the only repos large enough to cause problems with the asshole AI scrapers. My solution was to put the web interface for those repos behind oauth2-proxy (while leaving the direct git access open to not impact my CI jobs). It made my CPU usage drop 80% instantly, while still leaving my (significantly smaller) personal projects fully open for anyone to browse unimpeded.