My monetization strategy is unironically to offer a de-anime'd version under the name Techaro BotStopper or something.
It's a clever (and hilarious) strategy that will probably sell at least a few licenses. As an anime hater I'd be motivated by this.
Just change the pictures in cmd/anubis/static/img/ to whatever you prefer, I think.
Or, alternatively, you know, pay the author for the work they've done
Sure, if you're going to deploy it on your company site, but I think if you're running a personal website and want to throttle LLM crawlers without falsely advertising that you're a furry, you could just go and modify this piece of MIT-licensed software.
Or you could pay for BotStopper and have RPM/DEB packages too.
Or, alternatively, just embrace anime-porn content spectrum. I mean, just compare platforms that are free of it and ones that are chock full, and see which ones die and which grows.
That's kinda what the company Friendly Captcha does