the revenue is so low that no one is going to bother with them, also they are completely in crypto currency , there is no fiat involved there, so not taxable and obviously legal
Exactly, faucets are operating on really low volume so they are irrelevant. The Governments mostly care about bitcoin exchanges, marketplaces and casinos since there is a bigger bitcoin volume.
But sometimes govt. do interfere in there business.
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And central banks keeps on releasing warnings saying stay away from these cryptocurrencies.