Exactly, you hit the nail on the head. Orgs don't get money from prizepools, they get them from sponsors, merchandise sales etc. Who sells more shirts, yay or Bob? Who has more people on stream? Who's tournaments are more watched? That's what sponsors pay.
So yeah again, exact same case than traditional sports, Women don't get paid less because "They are worse and biologically inferior", they get paid less because less people watched them play, as simple as that