It's not just like you can just have a few hundred lines of secret sauce implemented in Python and then go and fill your boots.
The costs of maintaining a trading platform are very high. You have to be colocated with brokers/exchanges, and have a full market data and trading platform optimized down to microseconds. You need a large data and processing farm to backtest your algos. You need the legal structure to dodge all the tax. You need access to lots of GPUs and FPGAs to train your models and execute fast.
The costs of maintaining a trading platform are very high. You have to be colocated with brokers/exchanges, and have a full market data and trading platform optimized down to microseconds. You need a large data and processing farm to backtest your algos. You need the legal structure to dodge all the tax. You need access to lots of GPUs and FPGAs to train your models and execute fast.