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How to prevent spam on forums?

I currently use hcaptcha on my forum, and I have banned a few IP addresses that signed up with bot accounts. I usually don't get fake accounts, but Xenforo has built-in feature to check IP addresses shared with other accounts, so I monitor users that way.
 
I have noticed that most forums get a large number of spam signups, who post junk on the forum. What is most effective method to prevent spammers from registering and posting on a forum, to control spam?
Cloudflare turnstile generally stops them and blocking the known spammers via IP blocker(waf) settings on cloudflare.
 
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