I think it's impossible to become successful in Bitcoin so fast unless maybe he was able to time the market correctly and accumulate aggressively or lump sum when the market was at dip and sell out when the price increase if this is what happened then it's not investment but trading/gambling.
Well it's very wrong to put all hope on one basket abandoning all other work and focus all on Bitcoin can be very problematic unless such person is gambling which is too risky maybe he never got the right knowledge about Bitcoin investment it is better he accumulate from his discretionary income using the DCA strategy and hodl for long, Bitcoin investment Is a long time Investment so we should accumulate with the amount we can afford to loss incase it doesn't went as plan it won't affect us emotionally.