The strongest defense isn't a single killer app but a suite of a dozen deeply integrated products serving the same customer. This creates immense stickiness and cross-selling opportunities. AI dramatically reduces the time and effort required to build out such a multi-product surface area.

Rocket Lab's acquisitions were a strategic move to own the spacecraft component supply chain. This vertical integration creates a massive competitive advantage because the external supply chain is too small and fragmented to support building satellites at scale, effectively walling off competitors.

To survive against foundation models, startups need moats that are structurally different from what large AI labs will build. This includes integrating with physical sensors, creating marketplaces with network effects, or building full-stack businesses that become the service provider (e.g., an AI-powered wealth management firm), not just a software vendor.

Stable's defensibility comes from its complexity. It had to build both a customer-facing SaaS app and a separate, complex internal software to manage its physical mail-processing operations. This dual software requirement creates a significant barrier to entry for pure software competitors.

When creating a fundamentally new product like Cerebras's wafer-scale chip, supporting vendors don't exist. This forces you to own the full stack, from chip to software. The expertise gained by building this ecosystem yourself becomes a powerful, hard-earned competitive advantage.

The business isn't just software; it's a complete system. By sourcing and providing commercial-grade hardware that's pre-configured and designed for a laundromat's harsh environment (e.g., lint, humidity), they create a high-friction-to-switch solution that pure software competitors cannot easily replicate.

The idea that "moats are dead" is a misinterpretation of a changing landscape. While a specific product feature might no longer be defensible, durable moats are re-emerging in other areas like proprietary data, unique distribution channels, or deeply ingrained platform ecosystems.

The defensibility of complex hard tech companies doesn't rely on a single patent or technology. Instead, their moat is "novel in the aggregate"—the difficult-to-replicate integration of dozens of complex systems across design, manufacturing, supply chain, and regulation. This holistic execution is the true barrier to entry.

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.