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That said, PoW doesn't have to be subsidized by third parties forever. Wallets could introduce various kinds of fees to cover their expenses with calculating the PoW on their own servers, for instance. Then you have systems like https://github.com/anarkrypto/P2PoW that seems to incentivize PoW providers more directly (I haven't explored it much yet).
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Hence, a higher number means a more popular project.