I read a tweet from Jack Dorsey that said Square would end up paying a significantly more than Salesforce (Link: https://twitter.com/jack/status/105331214981509

I read a tweet from Jack Dorsey that said Square would end up paying a significantly more than Salesforce (Link: https://twitter.com/jack/status/1053312149815091200 https://twitter.com/jack/status/1053312149815091200). Why is that? Is it because financial services/payment transaction type businesses are taxed more or because this is a tax on "gross receipts" which potentially impacts these payment companies more because it includes income from interest, which they presumably have relatively more of? Or something else?