That's because they're not getting banned. They have nothing to lose, and if some of the spam accounts earn Merit, they can up their game.
I don't understand why they're not getting banned; they're spamming the forum, using AI content, posting bursts, and possibly creating multiple accounts to appear their content is engaging by replying to one another, yet none of the accounts I've reported in the past few days, along with other members, are still roaming the forum, continuing their AI spamming spree. Eventually, we'll all give up and surrender the whole section, or perhaps the forum to them.