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Source:
The declining hasrate with ethereum increases the chances of a 51% attack. https://cryptopotato.com/the-declining-hashrate-of-ethereum-increases-chances-of-51-attack-but-is-it-possible
Image source: https://bitcoin.es/actualidad/podria-ethereum-ser-un-deposito-de-valor-mejor-que-el-oro-y-que-btc/