While there are still forums using old software, and more importantly, not moderated, which are overrun by spam, surely this isn't the case for those that keep

While there are still forums using old software, and more importantly, not moderated, which are overrun by spam, surely this isn't the case for those that keep up ? (I'm also wondering how much field-specific registration questions help there, and what are the non-GAFAM alternatives to Captcha ?)