To avoid being made obsolete by a frontier AI model, startups need a strong moat. The three most defensible moats are: 1) building hardware, which AI cannot physically replicate, 2) establishing strong network effects where value increases with more users, and 3) operating in a complex, regulated industry requiring human interaction.

The long-held belief that a complex codebase provides a durable competitive advantage is becoming obsolete due to AI. As software becomes easier to replicate, defensibility shifts away from the technology itself and back toward classic business moats like network effects, brand reputation, and deep industry integration.

Unlike software distributed instantly through browsers, physical AI diffuses slowly across varied industries, geographies, and machines. This makes time and longevity critical factors. Customers need a stable, long-term partner, making it difficult for new, less-established startups to compete.

As AI commoditizes software, hardware is re-emerging as a key defensibility layer for startups. A decade ago, VCs avoided hardware, but now a physical device tied to a software subscription creates powerful stickiness and justifies high valuations, representing a major shift in investment strategy.

As AI commoditizes software, the most defensible businesses are no longer asset-light SaaS models. Instead, companies with physical world operations, regulatory moats, and liability are safer investments. Their operational complexity, once a weakness, now serves as a formidable barrier against pure AI-driven disruption.

The barrier to entry for software has dropped near zero. A company's moat can no longer be the millions of man-hours invested in its code. AI enables startups to replicate complex products in months, forcing CPOs to find new, more durable sources of differentiation beyond engineering effort.

As AI makes building software trivial, its value as a defensible moat is collapsing. The new moats are brand, distribution (influencers, email lists), and "atoms"—physical world services like clinics and medication that are complex, regulated, and cannot be "vibe cloned" over a weekend.

Top AI labs realize that progress in digital, keyboard-based AI is accelerating so vertically that it will soon saturate. The next major frontier for innovation and growth will be applying AI to the physical world: robotics, manufacturing, and industrialization.

AI makes it easy to replicate successful software, diminishing moats. This threat of being "vibe coded" pushes early-stage investors like Hustle Fund to seek defensibility by backing more complex, harder-to-copy infrastructure and hardware companies instead of just applications.