That was incredible yet unbelievable story of how the person that the OP have mentioned accumulated such a big amount of Bitcoin even without putting up an investment through fiat and those have gathered only by just donations. Maybe at that time Bitcoin was just a small amount compared for today and if that person have managed to take into hold with those Bitcoins for years since accumulation, he would really be a multi millionaire as of the moment that Bitcoin's price have boom compared to what it have before.
the crypto world is really full of surprises huh? it must be very valuable and very useful if it is really used for a noble purpose.
there's an important lesson from this, as you said, it could be the accumulation of a small number of donations, which is collected later into a large number. so don't be discouraged how much pub btc we have now, consider it a savings, who knows in a few years it could rise to hundreds of times, so don't give up.