Yep, they remind me of the free 'domains' you used to be able to get back in 2000-2005 that were crap like mydomain.ko.cc. By far the least legitimate one I see is .ai - I seem to immediately write those off as some half-baked chatgpt wrapper, or worse a landing page for a product that doesn't exist that would also just be a chatgpt wrapper if enough fools handover their email address. That said, I do like .io for tech sites. I think domains by area/industry are mostly sensible.