When I run through Copenhagen, the outlines of ancient moats and city walls subconsciously guide my path. These once-imposing barriers are now barely visible, swallowed by bustling streets and vibrant parks. Reflecting on the city transform beneath my feet made me realize something profound about the moats we build around our startups—they might be just as outdated.

City moats and walls were essential for protection in the past. They kept invaders out and defined the limits of a city. But as times changed, so did the needs of urban life. Advances in technology and shifts in how people live rendered these defenses obsolete. Instead of isolating themselves, cities opened up. Walls came down, moats dried up, and wide boulevards replaced narrow, fortified streets. This openness allowed cities to expand, connect, and innovate in ways that closed-off defenses never could.

Urban planning teaches us that cities thrive on connectivity and flexibility. When cities removed their moats, they didn’t just open up space—they unleashed potential. Public parks became gathering places for ideas, wide streets facilitated trade and movement, and mixed-use neighborhoods fostered diverse interactions. These changes made cities more adaptable and resilient, capable of evolving with the times rather than being stuck behind old defenses.

Startups are much like these cities. Traditionally, they build moats—unique technologies, strong brands, or exclusive resources—to protect themselves from competition. But just as city walls became barriers to growth, these business moats can limit a startup’s ability to adapt and innovate. In a world that’s constantly changing, clinging to outdated defenses can prevent startups from seizing new opportunities and collaborating in meaningful ways.

The disappearance of city moats wasn’t just about removing barriers; it was about embracing a new way of thinking. Open cities became hubs of creativity and collaboration, where ideas flowed freely and innovation thrived. Startups can take a page from this transformation by focusing less on isolation and more on building interconnected, collaborative ecosystems. By doing so, they can foster environments where creativity and adaptability are prioritized over rigid protection.

Public spaces in cities today are thriving because they encourage interaction and the exchange of ideas. Similarly, startups that create spaces for teamwork and open communication can spark breakthroughs that rigid structures simply cannot. Decentralized growth in urban areas, with multiple centers of activity, shows that diversity and flexibility lead to more resilient and innovative communities. Startups can mirror this by spreading their efforts across different areas and forming varied partnerships, rather than concentrating all their resources behind a single, restrictive moat.

Ultimately, the need for moats in cities faded because openness and connectivity proved to be far more valuable. Cities that embraced these principles became more dynamic and resilient, capable of weathering changes and fostering continuous growth. Startups must recognize that the same applies to their businesses. Letting go of outdated defenses and embracing a more open, collaborative approach can lead to sustainable growth and lasting success.

As I finish my run, the absence of moats in Copenhagen reminds me that some defenses are better left behind. Maybe the concept of moats is ripe to die.