If you have no money, ignore them and keep building your product. You could be profitable by the time anything comes of it. The court system is notoriously slow

If you have no money, ignore them and keep building your product. You could be profitable by the time anything comes of it. The court system is notoriously slow. In my experience, most lawyers are sloppy. You can make their life difficult— Unlisted number, separate Google Analytics accounts, PO Box, private registration, call forwarding, redirect their corporate subnet to Google, etc. It should keep them busy enough to at least mess up the paperwork, they always do.