There should definitely be upper limits to how much profit you can make and to how much in assets and savings one can have, after which the excess would be poured back into society. Tbh, usury itself shouldn’t be a thing (it used to be a sin 🤷), and with it would go fractional reserve banking and all forms of financialisation. And, of course, nobody is more entitled to the fruits of their labour than the labourers themselves, and the rest should follow from there.