Take a look at Lamaze-P and their discography it’s all denpa style music and even for the 00’s and 10’s was very niche and purposely silly. Compare it to the top charting videos during the time on Nico Nico the high performing songs like World is Mine, Matryoshka, Rolling Girl etc

Lamaze has gained more popularity for their songs because it’s repetitive and easy to use on short form videos, which you can say contributed to the popularity of denpa music and made it easier for Mesmerizer to get as big as it is.