[mattbrewsbytes]

From a business sense, I've heard it described when a company has significant market share with longer contracts, not monthly SaaS types of businesses where in theory everyone could leave at once.

A technical moat? The only thing I can think of is something like search with Google or a company with a patented, hard to build technology, probably involving hardware or something requiring getting thru legal regulation. But legal regulations are a legal moat, not technical.