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"They immediately generated enough audio readings to max out the free tier"

It seems this is part of the automation, it got flagged based on this.

By the way, I am quite happy with JavaScript based spamfilters, they work quite well for small websites. The service Stop Forum Spam is something that seems fit for this, also at bigger scale. I assume Akismet might be good too, but it is somewhat leaky in privacy, depending on what you send to it.

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Stop Forum Spam looks nice. It's great they're giving the data like this. In fact, I'm somewhat surprised there's no software download to self-host. Seems rather easy to make, given the data files.

Are there any other filters you recommend?

This was already my list of "approved" spamfilters :) I don't know any others that I like and are low in false positives.

I'm wondering how much a Hashcash implementation would help. The approach doesn't seem to be widely attempted. Maybe because we assume spammers are using botnets anyway and don't care about computational cost?

OOPSpam is a privacy-friendly alternative to Akismet.

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