As moderator I've banned them as a member, and deleted their posts that weren't already replied to as "SCAM" like you did here.
All first posts for new accounts are moderated, but these AI-automated scams has gotten more rigorous over the last few years.
It got easy enough for me to block them when they post generic non-650b non-rando bike parts for sale as their first post, but they've also started trying tricks like generating replies to human questions first, or asking questions themselves!