I think it was more alive 10+ years ago, at least with this board. Basically part of it is >>10929675 where sex sells, and sites like onlyfans have made it where low effort cosplay costumes bought online for porn only. Cosplay porn as become another tag for the overall porn industry than the original goal of dressing up as something you like as a form of expression. So seeing anybody do cosplay for anything nicher is really rare in the modern era, lewd or not. Covid/lockdowns pushed this even further. This also has a massive thing with normalfags being weebs in general, meaning being a weeb isn't a special status like a geek anymore.

tl:dr: Cheap cosplay porn replaced most of it with normalfags going to cons, drastically changing the idea of cosplay for most people being about porn than self expression.