Funny enough, there is a bit of conspiracy involved. Christian conspiracy, namely. Turns out when you forbid an ethnoreligious minority from holding any except a few careers for hundreds of years, many of those ethnoreligious families will develop the capital and social connections necessary to do those jobs well. Who could have guessed??

Racism/religious bigotry is so fucking dumb. And self-defeating. Fuck, forbidding Jews from farming? "We don't want you to be peasants, that's too good for you - handle large amounts of money instead"? Medieval Christianity was stupid as fuck.