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They do work and they do pay out. The problem is you get something like a penny an hour at best. Also because of network fees bitcoin costs $13 to send a transaction so I would do dogecoin faucets if any at all. Dogecoin has something like a penny fee at most.

And the people who run the major faucets are earning loads and giving you a very very small percentage of what they are earning and you are earning their money for them.