Finding a business model for an open source projects is really hard, but "pay us to remove the catgirl pictures if you want to look professional" is one of the coolest attempts I've seen so far:
https://anubis.techaro.lol/docs/admin/botstopper
If you have a fediverse account, you can quote this note from your own instance. Search https://chaos.social/users/rami/statuses/115213216610950473 on your instance and quote it. (Note that quoting is not supported in Mastodon.)