Three things to help answer your question.

#1 Penny stock price volatility. Compare penny stock volatility to crypto coin volatility. Penny stock volatility is much higher this typically makes it a more attractive option to day traders. (Short term trading)

#2 Examples of people investing in dividend re-investment plan(DRIP) stocks earning them enough over the long term to retire early. There are documented cases of this happening. (Long term buy and hold)

#3 HFT(high frequency trading) / dark pools and the substantial advantages they can offer over crypto trading. (The best platform for algorithmic trading, offering many built in advantages over crypto bot trading)

To break it down, penny stocks offer higher volatility than crypto. There are documented cases of long term buy and hold, dividend re-investment plans(DRIP) being extremely successful over the long term. HFT trading offers many significant advantages to bot trading. The long term growth of crypto is probably the most attractive thing about it. There probably aren't a lot of advantages to the trading aspect of it unless you own an exchange, are a whale that can afford to pump & dump or invest in some pre-minded altcoin.