The investors aren't going to let you burn all the cash just because. They want out now with whatever is left so they can flip the coin to the next bet.
Maybe if the investors could be held liable for the damage they cause for suddenly shutting something down like this, they would be more likely to give customers more warning before shutting something down.
In reality, they had to have known for months. The director were probably just holding out for a Hail Mary funding injection.
This is bad bad business, especially for a financial services company.