adam back deserves kudos for inventing PoW but PoW never became useful until it was applied to bitcoin, and the history of shitcoins using PoW is pretty clear that it doesn't work well for anything other than bitcoin.
i keep saying this to PoW enjoyoors but they just aren't listening.
firstly, a desktop computer is way faster at doing EC pubkey derivations than a mobile
secondly, they don't exist yet, exactly, but it's conceivable that AVX/AVX2/AVX512 and other SIMD implementations probably could be created that would put the desktop computer far ahead of mobile devices
third, if there's money in spamming a network protected by PoW, they will do the investing to build pubkey derivation ASICs and then even desktops are game over. the spammers will win because their profit margin is sufficient that they can afford to bypass PoW by using accelerators.
the only reason why it works for bitcoin is because bitcoin is worth more than the cost of PoW accelerators. they have been on the network since 2014 and every year leap ahead by several zeros most of the time.
the only reason why it works for bitcoin is because bitcoin is more expensive than the asics. and this is a fact because otherwise it would not pay to mine.