There is another kind of moat - Geoff Gannon calls it demon dust, but basically this is the one in which your product is a small, but critical component of a larger entity, but since their portion in the cost structure is small, they have pricing power, and maybe only you have the scale and expertise to manufacture or design it. The firm I mentioned - IPHS is like that, their phosphate products are important ingredients in food and other products but only form a portion of the cost structure.
VIFL had something similar, but it got acquired.