Protectron

Protectron markets itself on the machine-learning angle: instead of only matching against fixed word or link lists, it scores incoming messages for spam-like patterns, which in principle catches paraphrased ads that simple filters miss. It also reports basic security and activity analytics, positioning itself between a pure captcha/anti-spam bot and a light analytics tool.

The claimed scale — thousands of groups with millions of combined members — is a reasonable trust signal, though it comes from the bot's own marketing rather than an independent source. The interface is English-first; expect to test it against your own community's spam patterns before fully trusting the automated actions.