The one who have bought bitcoin just to get some profit in the bull run will quickly sell whenever dump starts like first few month of this year.
Institutional investors and whales will sell when all were buying and buy when all are selling like right now. They are buying..
Early bitcoin investors and adopters sell some part of their coin at peak prices and hold remaining without getting affected by any market sentiment.
New investors are the one who loses heavily during dumps and they buy at peak prices.
So, when people dumps their coin varies in case of bitcoin and yes there will always be some sellers and buyers in the market which is normal. I don't think selling bitcoin for profit can be considered as betraying bitcoin.