The US and countries with ties to it created and owned basically all historical internet infrastructure.

Kind of hard to even learn about Esperanto if you’re living in an area that lacks internet access. Also Much harder to host or participate in online communities for a niche topic if you don’t have easy internet access.

Furthermore, the net is still largely written in English, so unless you speak some English it’s going to be difficult to find communities for niche topics you like.

Aka former Redditors. Although actually both maps look to me to have a much stronger leaning more towards European than strictly USA affiliation?

Yes, but it's also the "people have surprisingly narrow climate niche (and it's not concerning)" map.