The biggest flaw in this suggestion is where will the young investors will get that 200$-500$ investment money in daily basis. Even a grumpy investor like me with a decent cash on my bank can’t keep up on this high frequency investment. 
If someone can invest 200$ per day on Bitcoin, I guess he doesn’t need to aim to become a millionaire since he already is. Maybe remove 1 zero then this thread make sense.
Indeed if they could invest $200 daily they might already be a millionaire, but jokes aside I agree with OP's suggestion to continuously invest in crypto as much as you could, even if it is a small amount, just keep on accumulating.If someone can invest 200$ per day on Bitcoin, I guess he doesn’t need to aim to become a millionaire since he already is. Maybe remove 1 zero then this thread make sense.
And also make an investment plan, how long do you plan to hold it or what's your goal in investment.