Why would you let them accumulate an unreasonable amount of wealth if you then expect them to give it back to poor people? Why not limit the wealth in the first

Why would you let them accumulate an unreasonable amount of wealth if you then expect them to give it back to poor people? Why not limit the wealth in the first place to ensure that everyone get its share? My thoughts on this change quite often, but if we were in a situation where we had a hard limit on wealth I think there should still be the chance to accumulate it, and the people who did the best that year get an award for it. Just to keep the incentive there. It's not like someone who has over 100 million in the bank is putting in the effort just because they want more things.