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Not all ERC20 tokens are created equal, it simply means that the token implemented the ERC20 interface, it has a transfer() function as per the ERC20 spec, but
by m19 4y ago
Not all ERC20 tokens are created equal, it simply means that the token implemented the ERC20 interface, it has a transfer() function as per the ERC20 spec, but that transfer() can check if an address is blacklisted. For example, take the WETH