Yes. Hence the 'mal' part.
Investment should be going towards enterprises which produce actual value. If the only way you can produce value is by throwing away money through predatory pricing, then you aren't creating value. And so without any value to create, eventually you blow up and lose a bunch of people their money.
When enough people lose enough money, people stop lending their money so freely and the business cycle starts the contraction phase. Now good enterprises have trouble getting capital, so they delay purchasing all of those cool servers/computers/whatevers. Since the companies selling those things now receive less orders, they order less from their suppliers, etc. Suppliers go under. People lose their jobs. People without jobs spend less, which kills demand further. Fuck. etc.
If it helps to have a misleadingly simplified 1 phrase summary: you can think of malinvestment as taking money from workable enterprises in the future and funnelling it into shitty enterprises now.