There are smart contracts in the Ethereum and Binance network making millions a day extracting transaction fees with much less than 1k loc. The code is even public.
Can you give me some examples. Also I personally feel as if most of these are saturated and I don't think that I could earn a million with such loc. and maybe its me but personally I don't like touching most crypto since its grift. And the only one I'd like is monero for privacy but I doubt how much I need it anyway.
