Personally I think it is huge a problem.
It's huger than huge and has been for years. With AI getting better and more widely used, it's only going to get worse unless AI/bot posts are dealt with promptly and the jackoffs who employ tools like that to basically wipe their asses with the forum are given a swift ban.
In my estimation, most users know best and generally ignore this type of spam. Most of it are reported to moderators who delete or lock such thread but that is the best they can do .
Ignoring is fine, but my suggestion is to do it
after you've made a report to the mods. They rely on the community reporters to point them to problem posts and all sorts of things, and if one really cares for bitcointalk they ought to take the time to give them a heads-up when there's spam, suspected AI usage, zero-value posts, etc.