There must be some easy solution to either prevent or limit spamming the forums. I've seen some suggestions last time it happened about limiting posts for new members (I'm personally not a huge fan of this) but perhaps limit the timeframe in which any single person can create new threads on the forum, it seems all these last ones were created in the same minute.

I'm not a programmer but we must have several in our growing community, any of you know what can be done?

In my experience, almost any CAPTCHA solution, even the humble reCAPTCHA (https://patrickhlauke.github.io/recaptcha/) will 'solve' our current problem.

I'll wager what we're currently the target of isn't malicious spammers, rather a simple script running off some remote computer just scanning for unprotected forums and posting whenever it find that, if you can force spammers to need more sophisticated measures, or even human intervention, the amount of spam will dramatically decrease.

Here is a website programmers perspective of CAPTCHA effectiveness:

https://blog.codinghorror.com/captcha-effectiveness/

Even if this article is old, it explains the concept behind CAPTCHA and why it's so effective, here is a more recent article on current (re/no)CAPTCHA methods:

https://www.gravityforms.com/rip-captcha/