No, that's not the lesson. Upwork the platform scammed him, not the 'unethical' clients. The clients were looking to settle the bill.
Re:Data scientists shouldn't use Upwork
by closetohome on Thursday July 11, 2019 @05:38PM
(#20416126)
I mean, the clients may be unethical too. But more in a not-hiring-minorities kind of way than a scamming-their-contractors kind of way.
Maybe the lesson here is that people doing unethical things will take the opportunity to do more unethical things, like not pay you, and it may well be in your self interest to apply your ethics when choosing a job? Upwork doesn't look great here, but seems like it's hardly the whole problem.