Cheap mining is an open invitation to attack the network. Once it is more profitable to attack the network than to be rewarded for mining the network, that network WILL be attacked. POS is "cheap mining". That's why the acronym for "Proof Of Stake" is identical to the acronym for "Piece Of Shit". It's no coincidence. Why do you think Ethereum is the only protocol that has not regained it's highs in the open market? BTC = $2,800.00 LTC = $48.00. ETH still languishes at 35% below it's high water mark. They can thank POS. ETH is an inherently flawed system. Number one, it's attack surface grows exponentially by the day. Number two, it is providing a venue for thieves and parasite such as GSA, JP Morgan, Google, FB etc etc to manipulate the platform to host their theft and corruption. POS=Piece Of Shit.
POW is not much better, especialy in bitcoin and lltc algos.
All mining under control of few big players who can attack network, or manipulate all future of coin if that is theri intrest.
All now seen crypto coin tehnologys have big problems.
Pos has one plus, its ecology friendly...