These aren't serious people.

I didn't look at it this way at all, but you're absolutely right.

I do find it strange I only found one mention of Taliban here: https://www.state.gov/foreign-terrorist-organizations/

Designated in 2010. Probably because exactly what you said. The historical mess.

Aren't they recognized as a terrorist group vs a government? I'm guessing legitimacy is the main issue here.

It doesn't matter. The points are made up. I joined a big one (lemmy.world) hoping it will be less likely to disappear so I don't have to make another account again. GG!