Some comments from the Ventoy forum to think about...
Spam rate is increasing -- and with it the SEO benefits spammers collect by this evil -- and the problem is bound to get worse if nothing is done, until forums collapse under their weight.
I saw it happening many times in other places; this reflects badly on Ventoy as users come to the forums to find specific help.
An easy measure that has worked well elsewhere, is preventing automatic first posts -- i.e., after registration, all users first post has to be approved by the team before it goes public.
Also, users posting spam should be immediately banned.
Other anti-spam measures can be adopted, scores of examples around the web. (E.g., see [External Link Removed for Guests])
They can be very sneaky, and will come back days or weeks later and edit the post to insert the spam. So we have also limited the edit window, until the user becomes more well known (reputation, other criteria).