Which billionaires are good?
Microsoft/Bill Gates is a good example. Without MS, we'd have open source and stuff like that. But it's just nice to have Windows, MS Office, less polio. People like Warren Buffett stabilize the economy, while people like Soros destabilise it. Nearly all the Big Tech ones are pretty good - they pay wages as high as possible.
Most are law abiding. Most of them actually want higher taxes but also want their competitors to be paying them as well. Bezos gets slack for dodging taxes, but he does it legitimately - most profits are reinvested and they actually pay good salaries even if they overwork their staff.
Bill Gates is doing a lot of good too, although he was pretty ruthless in the beginning against other companies.
A 'bad rich person' is often someone who supports the opposition party or once tweeted something disagreeable. It doesn't matter if they employ thousands of people and generously give to charity.
And any individual "employing thousands of people" is really "exploiting thousands of people" unless the thousands of employees' wealth is increasing at a faster rate than the employer's.
We still have plenty of robber barons who are doing borderline human trafficking but I don't think these are even that bad. They're exploiting some helpless guy in Bangladesh, but in the end, that guy is better off.
The truly bad ones imo are the "silver or lead" ones - you do things their way and you become rich, you go against them and you're literally dead.