If every single user wants to be a soulless robot (pure capitalism), then yes. However if the userbase understands that larger accounts will be subject to larger fees, in order to support smaller accounts, then I would like to think at least some users would support that. Not everything in life has to be decided on a purely selfish basis.
So OnlyFans should pay people to post nudes ? (Rather than providing a place to post pictures and charge other people for them, in case you missed it)
I see this same argument made about Tinder, from guys who can't get laid.
You realize it's just a platform don't you ? Those are real human beings on the other side of that screen. OnlyFans can't choose for the humans on the platform.