- Filing a frivolous lawsuit makes the plaintiff liable for the defendant's legal expenses.

- Repeatedly filing frivolous lawsuits can get you labeled as a vexatious litigant, and if labeled as such you need a judge's permission to file even a valid lawsuit.

- Lawyers knowingly participating in frivolous lawsuits or vexatious litigation can be disbarred.

For these reasons, I don't think you will see corporations filing a lot of meritless nuisance lawsuits.