If large investors leave the project, then this project is probably no longer interesting to them and they left to fix the profit. Probably, this project and its coin will no longer be able to show growth, because this requires demand from the crypto community. I have a number of such projects and their tokens, which, in my opinion, seemed to have potential, but after their activity came to naught. In simple words, they have now depreciated and all that remains is either to wait for a miracle or to sell and get at least a little money. Of course, it is best to sell cryptocurrency when it costs good money, but there are also times when you need money and you have to sell your cryptocurrency ahead of schedule. In general, it all depends on the situation.
That is a common problem this time, some (most) project developers abandoned their project if they have noticed that there is no chance to make money for it. Even a single note to give awareness to the community is seems hard for them to do it. Probably, the intent is not to make a project that becomes useful to the people, but their intention is to scam us. And that particular project that OP had mentioned, is one of them.