I think there is a whole bunch of additive reasons, one I think is novelty.
When Pt103 first was legal, a lot of the crowd would be base jumpers today. I think there was a special lure of being dangerous. Danger has moved on. Kind of like the most interesting man in the world commercials. I have a friend that loves to hash 70s tales, multi ratings, scuba, photo dark room, travel, dating. If I knew it wouldn’t blow his ego, I would be cracking those jokes.
I think some is just pining for the old days of adventure.
I think the little UL airport here tuned into a semi private RC field because of insurance. That was well over ten years ago. There were two hangars and about two dozen ULs in there. The last flying UL not at Oshkosh was 8-10 years ago, a Weedhopper. I helped a friend build a Legal Eagle, but he sold it right before cover. Only thing it needed that he did not have was a prop. He got rid of airplane stuff except his RV.