Conclusion and outlook:
Blockchains should adhere to a PoW mechanism if they want to retain the ethos of cryptoassets: decentralization and security. For use cases such as hard money, PoS is likely less desirable because the possibility of the wealthiest users gaining an overwhelming share poses significant problems for an asset whose value derives from its decentralization, security, and scalability, among others.
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Here's Kraken's blog post where this report was shared:
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I see what you did there kraken. Keeping ALL customers happy is the safest strategy.