They have a shitload of big contracts with a great many companies across the world. Money keeps coming in.

Legal actions take time. Years. Sometimes decades.

The software, when it isn't bricking computers, is actually pretty good.

This could equally have been caused by any other software running at ring 0. That's most antivirus software and most drivers. Drivers caused BSODs all the time - the difference here is only one of scale and timing. And, as it turns out, some pretty terrible quality control, test processes and release scheduling - and that is likely to be the focus of many of the legal actions.

Your reference to a hacker is spurious - deliberate vs accidental is a major distinction. As is cause and effect - Microsoft can be seen as equally to blame for allowing software to run at ring 0 and allowing this to happen.