As a devoted, volunteer content curator on Stack Overflow for the last 2299 consecutive days, a moderator of a community in the SE Network, AND as the user who first discovered the rapidly posted AI content in this question...
I am SUPER PISSED OFF!
This was just one user who was spraying content with mere seconds between posts. Can you imagine how quickly the Stack Exchange Network will be polluted with unvetted content when hundreds of users repeat this strategy? This will overwhelm the outnumbered curators with the time, privilege, and will to curate.
Those who care are now hamstrung.
Moderators cannot take action to impede their efforts.
I cannot bulk downvote answers from the solitary poster because then I will be guilty of targeted voting abuse. This will lead to suspension -- and of course, then there will be one less curator to pitch in.
Before AI-generated posts, it took curators less energy to handle unsavory content than it took other humans to create it. Now posting artificial content takes nearly no effort or time at all.
Don't even get me started on the impact of these hyper-FGITW posters multiplied by the "Upvote Fairies" who sprinkle upvotes on anything that vaguely smells like a reasonable answer.
I am having a hard time seeing a positive future for Stack Exchange if there are no protections put in place.
I also have a hard time seeing my future self devote so much of my free time to a network that allows itself to be aggressively polluted.