I believe it's down to cultural/medical change over the last generation or so. It's the whole cut/uncut medical thing. Many argued cut was good so we had a gen of males who once naked displayed...well...cut cock. But, now we're seeing the dudes who are of a gen where uncut was considered okay.
Personally...I recall in the last 10 years of seeing porn online - from back when I'd access crappy gallery sites, uncut was very very hard to locate online. There were few sites and finding any clips or movies was impossible.
Now...it's everywhere so yeah I think it's just that generational thing.
I think it's great to see so much uncut action now. It's great to see hooded bros.
Oh and I guess with the whole thing of sites like this where people air their turn ons or what they like to see, producers realise the $ to be made.
Jeez...I remember way back when when I found Pavel and his big hooded cock...I know why I watched him so much. He was one of the few uncut dudes with clips online. Even gay porn the cut thing was predominant unless you accessed "fetish" areas.