I think it's kind of stupid that we're defaulting to the idea that a billion dollars as sort of the default "well, that's too much money, nobody could ever possibly deserve THAT much money!" metric we're using. Not particularly because there are really any good billionaires, I mostly think that's not really the case and agree that any claim to the contrary would probably strain credibility.
About the most you could point to is somebody like taylor swift, or any musical performer, or athlete, someone who specifically gains money based almost exclusively on their command of cultural capital and ability as a performer rather than necessarily on extracting the surplus labor value of others, though to a certain extent, you have to have some sort of corporate backing or management company to reach that level, and even if those performers don't control it, there's probably some level of loaded complicity going on there. These types would maybe be just above the sorts of people who just run good or more ethical companies, as far as companies can be, on the billionaire morality totem poll.
No, my criticism isn't so much that billionaires aren't necessarily evil, because I think it's mostly true enough that billionaires are all evil for it to be as true a heuristic as a heuristic can be true. I think my ire draws less from that, and more from how this sort of like, meaningless agreement over this particular example doesn't really necessarily lend itself towards any more in depth analysis. We've put the marker too high, the standard too high. A billion dollars is obviously very extreme, you can see that with the comparisons from a million to a billion. What about a million, though? Is that bad, is that a bad standard of evil, if you have a million dollars, does that make you evil? Where's the cutoff, here? I'm sure plenty of people know someone with a million bucks, you could probably just point at anyone who owns a home in LA.
My point is that instead of some arbitrary cutoff we should probably just be looking at what's actually going on here in terms of the relationships at work and the constructed hierarchies. If that's the case then we can probably draw the line less at a billion dollars and more at anyone propping up this stupid bullshit type hierarchy, and specifically those more critical lynchpins which hold it together. Perhaps, like a "not necessarily a billionaire" healthcare CEO. Now that, that would be a good start.