So, what do folks use as a Google-free (ideally free software) alternative to #reCaptcha these days?
@saper @eloquence By malicious users do you mean users coding scripts in real time? That could be a case for, as Marcin mentions, hashcash. I like the idea of using a crypto miner to compensate you for cleanup time if someone decides to do it anyway but there isn't an open source one I'm aware of yet, just CoinHive, and it also tends to freak people out.
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