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having had the great misfortune of working on all of them, I'd highly recommend against.
Low pay, lots of search friction, plenty of scam and scam-adjacent tasks. (One guy on Upwork "desperately" wants me to visit a Tesla retailer and do mystery shopping... for $300, minus fees. Believe it when I see it, etc.)
More trouble than it's worth.
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Thank you for your honest opinion
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Upwork, Fiverr, Freelancer.com
There used to be a couple of them that paid Bitcoin but I don't think they are active anymore and there weren't many opportunities on them.