Which robber baron do you consider to be responsible for curing polio?
In the meanwhile, the technocrat administration we just got is putting the anti-vaccine activist RFK Jr up as Secretary of Health and Human Services. The progress we have made on eliminating Polio is at risk directly because of actions taken by this crop of billionaires. That is more on Musk and Zuckerberg than Gates, but these people cannot be trusted to use the power and influence they have for anything other than self-enrichment.
Trump bad, has nothing to do with Gates or Zuck. If you blame them for trying to prevent Trump from doing bad things, you should look into what they will benefit from and how they spend their money