Is it The Owl House? Has anyone watched it? Is it any good, or is it just more gender-people propaganda?

It is. First season is out, and no gender propaganda yet. The setting is neat and it's got an older (40+) woman as a deuteragonist that makes it more watchable for adults than if the cast was entirely children. It's pretty obviously for a tween/teen audience, though (school setting/teen characters/etc). I would've loved a show like this as a teen, so I'm watching it to scratch that itch.

teens need to have their own space on the internet where they can just teen-out and leave us alone, and without predatory adults salivating over them and trying to groom them

I mean, I've been hanging around online spaces since I was 12/13 and at the risk of sounding like an old timer, I've never gotten up to this sort of stuff. I think the internet landscape has shifted a lot in the last decade. Back when I was a kid, you kept that fact to yourself, and if creepy people tried to hit you up or if you ran into something you're not comfortable seeing, you closed the window and went somewhere else. Being a child counted against you so you don't share that openly and you took responsibility for your own comfort and safety.

Nowadays, a lot of minors are open about their age and use it as a shield against criticism. Parents use online spaces as a substitute for child supervision these days, whereas I had to earn computer privileges through doing chores. Conversation on social media platforms are being slowed to the speed of the lowest common denominator, which is some 13/14 year old whose parents are too busy to give a shit.

Either you get the parents back in to do their job (unlikely) or you start adult-only social medias or you pass a law banning children from most parts of the internet. It won't get rid of all the children, but you'd cut down on large portions of the idiots and the remainder would be smarter about it and assume more personal responsibility.

Not telling at you either, just musing.