Sharia law prohibits interest on loans. As such there are a bunch of loopholes to allow Muslims to have an economic stake in the game: https://en.wikipedia.org/

Sharia law prohibits interest on loans. As such there are a bunch of loopholes to allow Muslims to have an economic stake in the game: https://en.wikipedia.org/wiki/Islamic_banking_and_finance https://en.wikipedia.org/wiki/Islamic_banking_and_finance I believe until recent history Christianity also prohibited loans and debt, or at least usury debt.