Companies like Whoop and Eight Sleep successfully use subscriptions not because their hardware requires constant upgrades, but because recurring revenue is a superior business model. This creates a vulnerability: if users can bypass the software lock-in, the model collapses without significant hardware improvements.

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.

A powerful, non-obvious moat for software is deep integration with hardware. DJ software Serato partnered with hardware makers like Pioneer, becoming the industry standard. This makes switching extremely costly for users who have invested thousands in hardware, creating a durable competitive advantage.

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.

In a tech market dominated by AI disruption fears, consumer hardware companies are framing themselves as "AI-proof." The argument is that AI won't eliminate the fundamental need for physical products like Oura's smart ring, making them a potentially more stable investment compared to software companies.

Whoop's next growth phase focuses on obtaining medical clearances for features like AFib detection. This strategy moves the company beyond the crowded consumer fitness space and into the regulated medical device market, creating a significant competitive barrier that wellness-focused rivals cannot easily replicate.

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.

Drawing from Verkada's decision to build its own hardware, the strategy is to intentionally tackle difficult, foundational challenges early on. While this requires more upfront investment and delays initial traction, it creates an immense competitive barrier that latecomers will struggle to overcome.

Competitors using off-the-shelf iPads failed because the hardware couldn't withstand the restaurant environment. Toast's difficult, early investment in purpose-built, durable hardware and its associated supply chain created a powerful, hard-to-replicate competitive advantage that software-only players cannot match.