Why would I not vote yes on Prop 40?

Curious what others think. I’ve seen commercials daily paid for by the wealthiest Californians saying the state will somehow lose $25 billion if this passes. I’m not a math genius but if there’s a 1 time tax of 5% on billionaires in California, how’s that going to make things worse? Are we going to be told in the next ad that “trickle down economics” is the key to success? 😭