If I was running a project geared for the long-term, I wouldn't treat $50 million like "$50 million to spend", but as a $50 million endowment where the goal is to not spend the principle.
There is also the matter of scale however: if you could grow your users, maybe you could secure more funding/donors long term as well
But its obviously a lot more likely to be around long term if they don't blow all their cash in a short term attempt at grabbing a few more users and hope to get more later.