It can't stop human spammers. There's no claim to it being able to stop 100% of spam. At it's simplest it just provides captcha. You can enable other functionality like duplicate registration blocking, duplicate login blocking, etc.. within CB AntiSpam > Parameters. Not sure why reCaptcha won't work for you; did you correctly generate reCaptcha v2 keys for your site and supply them in CB AntiSpam > Parameters > Captcha > Modes > reCaptcha > v2? Invisible is also supported, but v3 is not supported yet (and may never be as it's a completely different type of captcha that analysis site traffic constantly).
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