Yeah the valuations of some of the projects are extremely high. Forking and doing it themselves could be an option. But we are talking about giants. They won't care about efficiency if they are losing market share. They will care about not losing share and focus. So instead of trying to focus on build a thing for a year they will grab it with cash. With a better valuation of course. The problem with current projects is nobody can differentiate between a good one and a bad one. Nobody wants to read white paper or source code. Hundreds of projects and much FOMO and nobody has time to actually understand the projects... So that happened.