Oh man, nailed it.
What's happening here?
Musician Patrick Metzger noticed this trend and called it the "Millenial Whoop".
Music, especially pop music, is based on patterns. It makes new songs seem familiar, because you've basically heard them before.
Yes, I gather that it's called "formulaic music". "Musicians" have been using that approach for years, thus explaining the depressing seemingly moronically repetitive nature of a lot of the music - and there's apparently been a lot of not-so-subtle sampling/copying going on at the same time, creating copyright disputes. Every now and then though, it seems that someone with a streak of creativity or an unusual catch in their voice develops a catchy new pattern/formula, and then lots of copycats move in to ride on its coattails.
I guess that's simply what one would expect to get though, with an industry that seems to have adopted a mass-production approach.