Either this thread is full of "temporarily embarrassed billionaires", or there's a lot of arguing in bad faith going on.
One human having a billion is like somebody weighing 1000 pounds. It's hella unhealthy for them (does anyone here imagine that Elon Musk is happy?) and it's catastrophically bad for the rest of society to have to deal with these people throwing their weight around.
Where do we "draw the line"? I dunno, could we consider something like 200 million? Judging by some of the responses here, probably not.