This is obviously where it's going to go, at least in the US. Things that are non-religious, non-Christian especially, pro-LGBT, and similar will be disproportionately pulled under "adult content" to ensure that children are not able to be exposed to unapproved ideas during formative years.

That has already been going on for decades, with satanic panic and banning of library books.

Exactly. Having lived through it already, I know what it did to me and I would never wish that upon another child. The internet saved me from being a religious, colonial, racist piece of shit like the rest of my family.