Knowing the history, it's easy to make fun of such tweets. There are different methods of investing and trading. One person prefers to buy with several years of investment in mind, another person tries to trade on an ongoing basis, multiplying their profits. It is not said that the author of the tweet did not buy even more btc in a few days. Today, the market is completely different than it was 10 years ago, and thanks to the various instruments offered by exchanges, some traders also make great money on falls. Personally, I don't like daytrading, it's too stressful and tiring for me, but there are situations when I sell my cryptocurrencies to buy them back at a lower price.