They do have an AI tag that creators are supposed to set where applicable, and there's an option to hide everything with that tag, but the enforcement is weak s

They do have an AI tag that creators are supposed to set where applicable, and there's an option to hide everything with that tag, but the enforcement is weak so there's a lot of obvious AI spam which isn't tagged. Many of the AI spammers are using DAs monetization features or promoting a Patreon so they're incentivized to not set the AI tag to maximise their reach.