My guess is that they don't, at least not in current form.
nym does not check out, at least in current form.
Didn't have much luck on Upwork either, to be honest.
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I did...as an employer, not as a worker. Although, I can imagine that it is quite difficult to cut through the noise. Job offers get very large numbers of bids, many of them insanely cheap. Like most things, you get what you pay for, and it takes an experienced nose to sniff the quality offers.
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