An old castle wasn’t safe because of its walls. It was safe because of the water in front of them — the moat. An enemy could be twice as strong and still have to stop, get wet, and slow down before reaching the gate. In investing, that same idea has a name: economic moat, the structural advantage that keeps competitors from catching up no matter how good their product is.
On July 7, Qualcomm announced it was buying a software startup called Modular for roughly $3.9 billion — paid entirely in Qualcomm stock. The move matters because Qualcomm’s core business is shrinking: nearly 20% of its revenue used to come from supplying modems to Apple’s iPhones, and that contract disappears completely when it expires in 2027. Qualcomm needs a new business, and it’s chosen AI data centers — a market where one rival already holds a wide moat of its own.
That moat isn’t about having the fastest chip. It’s about developers. Software is usually written using one company’s specific toolkit, tuned to run best on that company’s chips. Even when a cheaper or faster chip comes along, rewriting everything to fit it costs time and money — so developers mostly keep using what they already know, the way a chef who moves kitchens still reaches for the same familiar knife.
Modular built something different: software that runs on whatever chip you point it at, no rewriting required. That’s not just a product — it’s a tool built specifically to drain a moat, any moat, by removing the cost of switching.
Which raises the obvious question. A tool built to make every chip interchangeable was neutral by design. Now it belongs to one chip company.
Yesterday’s key. Today’s lock.
Not advice. Just how I see it.