Sustainable Competitive Advantages (i.e., Durable Economic Moats) - Best Examples?

Fellow investors,

What are your best examples of moat businesses (i.e., sustainable competitive advantages) you’ve seen (public or private), and why you think the moat is durable?

If you can, include in one or two lines:

• Company + industry

• What the moat is (brand, switching costs, network effects, cost advantage, regulation, etc.)

• Why you think it’s sustainable - and what you think could break it (inversion)

Looking forward to your examples.