If Microsoft is willing to spend millions of dollars and take a huge PR hit to sue you, it's safe to assume that whatever you've built is successful/popular enough to make you very a wealthy man.
Possibly it matters if it's not you that's sued, but you have similar usage as the company that is. Investors may or may not find that an acceptable risk if MegaCorp XYZ is currently embroiled in a large lawsuit.
For example, if your company had the same strategy as Google (and/or made some similar mistakes) with regard to circumventing Java licensing/restrictions, I could see investors or possible investors that were aware of that being somewhat spooked at certain points in the past.
At that point, who cares?