They can dump their investment but I don't think they are that weak to just dump it so early.
There are a lot of interested companies and individuals that wanted to invest their money into cryptocurrencies mainly Bitcoin. That could lead to more pumps in the upcoming weeks or maybe months which make this year one of the best years of Bitcoin. The year is still starting so we never know where will it lead and where will it go.
It is not about being weak or strong, it is about knowing the right time to get out and right time to get back in.
If you think bitcoin will drop a lot, sell at this current price, and go back and buy at around 40k and the price moves higher again, you will profit from this move.
I am not saying that is what will happen or anyone knows what is going to happen, but some whales think like this and sell their coins not because they are weak but because they think they could buy even more later on.
That is the difference between crypto and all other things, in crypto you could make any movement you want and that is very valuable, there is no government that can stop you in most of crypto world (aside from local exchanges in an out of your bank account) because governments have no idea what you are doing so you could 100x leverage some crazy coin and lose a million dollars in 3 minutes because you can, or profit 3 million because you can, and nobody will be able to stop you.