Comment by lloeki

> I get constant "Making sure you're not a bot!" anime girls

That's Anubis:

https://anubis.techaro.lol/

There is an unbranded version available, allowing image customisation under a paid tier:

https://anubis.techaro.lol/docs/admin/botstopper

The only other one I've seen deployed out there in any wide capacity is Cloudflare's.

Makes sense that Codeberg favoured an open and non-centralised solution.