The whole point is that the person who invested in bitcoin in 2010 would not have been able to hold it to this day. The temptation to sell and take profit is too great. Therefore, it seems to me that there is not a single person who still holds bitcoin since 2010.
I take two lessons from this thread:
1) Buy and hold as much as you can.
2) If you are going to take profits because the price goes up, never, ever sell everything you have.
Those who had $100 10 in 2010 probably would not have been able to hold them until today, but a good strategy would have been to make partial sales, without selling everything, when the price reached $100 to $500 to $1000, etc.