Well, ultimately, it's a lot of things. There's more visibility and acceptance. And it's also socially attractive in a way that it didn't use to be. And there can still be real hardships associated with it. (even if not discriminated against, being in such a distinct minority can be alienating)
Like Hoosier pointed out, the numbers of LGBTQ+ identifying youths has skyrocketed. Within certain circles it's certainly chic. (trendy lefty places)
I think some kids are dealing with mental issues and or simply the travails of youth and are looking for answers; peer groups, acceptance. Questioning whether or not you might be the wrong gender is suddenly on the table in 2023, and you have peer groups that you can glom on to and gain quick acceptance and belonging. That dynamic did not exist until just recently.
There's plenty reason a kid might be attracted to this sort of thing even if a parent was against it. (my god, rebellious youth, anyone? Peer group over parents, anyone?)
At any rate, it would usually be a rather big nothing burger but for all the life altering -- possibly permanent -- effects associated with going down the trans path. That's what gives me pause. It were nothing but kids playing with their gender, gender bending or whatnot, fine... but it's a bit more than that.