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> The only way to defeat spam

No, no, no. There are many ways to combat spam, and there is no silver bullet. "Determining whether you're a bot or not" is just one tool among many, and one that lets human spammers through, or gets too intrusive and starts blocking humans.

IMO the best approach still is to focus on the content they post rather than trying to figure out who/what they are.

Google wants you to think reCaptcha is the ONLY tool. That way they can get more user data.

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