The biggest mafia-style business in my book is visa/mastercard.
They literally do NOTHING but licensing a service with the layer for "yes/no" operations,
because banks are so stupid, that they couldnt figure out their own platform and API to do it and give the plastic companies the finger.
This doesn't really make sense seeing as both Visa and Mastercard were created by banks (Bank of America and Wells Fargo and a bunch of others)....It's not like these "plastic companies" just showed up and said "You need us" to the banks...