True but that doesn’t account for the different tax treatments between short and long term gains or the trading fees or the time required to make daily trades vs one trade.
"2019 has 252 trading days. Averaged out earning of $500/day is $126 000 of earnings in one year + your original 10k."
Believe me, the average day trader is not making $500 a day. And on many days they lose money. In fact stats show that most day traders lose money about 50% of the time. And then you may have commissions and other fees. Day trading is like playing these sub penny stocks. Occasionally you win but more often you lose.
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