Bitcoin and Ethereum are never compared when functionality is taken into consideration. The sole difference comes down to Ethereum’s smart contracts feature. However, every other project which has smart contracts, one time or the other, has been deemed an Ethereum killer.
The trend began back in 2018 during the ICO boom when EOS was considered competition to Ethereum’s smart contracts proficiency. Now, there is a reasonable chance that a minority of the readers do not know about EOS at all. And, that speaks volumes.
2021 has been different though. The DeFi ecosystem classified protocols in a different light and the importance of smart contracts has been realized further. The term “Ethereum killer” received more traction than usual, but might
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