netflix is also added ad supported tiers at lower prices, so chances are they're the primary account holders. That and the fact that they have a couple really good shows still. Netflix is probably nearly bleeding at the edges, or soon to be bleeding at the edges though, they're probably post pandemic high riding a little bit even now.
Though it's also worth noting people are actually starting to pirate media more now due to the breadth of streaming services that exist, it doesn't seem to be just the one service, it seems to be the fact that there are 12 now that's causing it.