Bots seem to be seasonal creatures. Some months you won't see any. And then some months you'll see four per submission. I'd just downvote and reconvene when it seems to be a substantial issue.
As for GPT, the bots you usually see on HN are just as easily written by humans. GPT makes sense for scale, but it's not very interesting when bots are posting at such low volume, so it doesn't necessarily have to be the case nor does it really change anything.
They have submitted two "blog posts" from their own website whose insightlessness reeks of GPT, whose comments here are nothing but bots from brand new accounts.
Yeah, bots - sure. GPT? No way. My rapid-classification pattern matcher, honed on two decades of running blogs and web bulletin boards, recognizes the shape, cadence and sound of these comments as indicative of the usual kind of spam comment, common in the last 15+ years.
I.e. they came out of some boring, old-school script.
(Though I do wonder, how much of the spam comments on random, long-forgotten wordpress blogs, ended up in the GPT-{3,4} training data.)
As for GPT, the bots you usually see on HN are just as easily written by humans. GPT makes sense for scale, but it's not very interesting when bots are posting at such low volume, so it doesn't necessarily have to be the case nor does it really change anything.