This really isn't a fair comparison. The degree of Bloomberg's wealth is unimaginable for most people - certainly it is to me. If Bernie's figure was correct that Bloomberg's wealth is equal to the bottom 125,000,000 Americans combined, there is absolutely something wrong with our system.
According to Forbes, this is the net worth of each of the candidates that was on the stage last night:
https://www.businessinsider.com/estimated-net-worth-wealth-2020-democratic-presidential-candidates-2019-4
Look, I buy into the argument that -- to a degree -- that too high of a taxation can discourage work or investment, but I also understand that the accumulation of too much wealth is a danger to our overall democracy. Hence, Bloomberg coming out the gate and spending $500,000,000 in just ten weeks in ad spending and suddenly skyrocketing up the polls with very little effort, and his winning the nomination would demonstrate to me, you, and the general public that our entire sociopolitical and economic system is completely rigged. Historically, that leads to a crowds-with-pitchfork situation.