Once more: it's just a subpoena. OP is looking at a few thousand dollars of legal fees and maybe a trip to wherever the court is. If you're operating a profit-seeking company in a legal regime that provides the protection that ours does, you simply have to be able to bear those costs. If your VC's or angels won't pay it, they aren't serious investors.
There are cases of this already happening in the case of poor people, otherwise vexatious litigants wouldn't exist.
I wonder if the judge even knew that one of the list of companies was "small company mctinypants" or just assumed all were massive and huge.