The rights of jews to earn a living were quite limited in Europe, Many professions were closed to them all one had to do was convert and those economic opportunities were open to you. (And it created alot of resentment among old christians, that all of a sudden new christians got the same rights as they did, becoming a christian didnt always end anti-semitism
Why do you think jews left the Shtetl for the big cities and the USA at the turn of the century, it was economics, they could not make a living in the Shtel.