Comment by kjksf

Paid spam accounts are removed as well, which you left out of your analysis.

Buying an account doesn't give you un-suspendable account.

All spam detection techniques are applied to paid accounts and they are removed as well.

This not only raises the cost but difficulty.

Just having money is not enough. Detecting 10+ payments from the same credit card is trivial.

There aren't infinite amounts of valid credit cards or Apple accounts to be used for verification.