Originally published at vibeagentmaking.com
In 1963, a zoologist named Robert T. Paine began prying sea stars off rocks at Mukkaw Bay, Washington. Before the removals, his plot held fifteen species. Within five years, it was a solid mat of one organism. One species had been holding fourteen others in existence.
The Cascade Is the Product
Sea stars don't eat algae or limpets. Those species disappeared because mussels overgrew them once the starfish stopped regulating the mussels. A trophic cascade is a chain of indirect effects -- always nonlinear, frequently counterintuitive.
AWS does not interact with Netflix subscribers or Ring doorbell owners. When US-East-1 failed for eight hours in December 2021, the cascade reached services whose owners never thought of themselves as AWS customers. The hub was invisible until it was gone.
Sea Otters and the Context Problem
Off Vancouver Island, sea otter recovery produced a strong cascade: urchins down, kelp up. Off San Nicolas Island, the same predator produced a measurably weaker cascade. The ecosystem's surroundings determined how much the keystone's job was worth.
Microsoft's Windows cascade ran hard through enterprise in the 1990s and barely turned in consumer mobile. The strategic moves were similar; the ecosystem was different.
Yellowstone Wolves and the Return Problem
Wolves were reintroduced to Yellowstone in 1995-96 after seventy years. Park-wide aspen cover dropped from several percent to under 1% and has not reversed at landscape scale. Removing the keystone can flip the ecosystem into an alternative stable state that resists reversal.
When BlackBerry tried to bring developers back, the mobile ecosystem had stabilized into iOS-plus-Android. The surrounding ecosystem had stopped being the one that produced the original cascade.
The Invisible Cascade in Tech
Twitter's API repricing in 2023 cascaded through research labs, civic early-warning systems, and data-journalism pipelines. Heroku's free-tier shutdown evaporated a decade of developer experimentation.
The pattern: keystones regulate levels below them. When regulation stops, the cascade rearranges levels you forgot the keystone was holding in place.
Where the Analogy Breaks
Three breaks: (1) Sea stars don't strategize or litigate; platforms do. (2) Time constants differ by orders of magnitude. (3) The convergence is real -- both fields independently found context-dependent cascade strength, alternative stable states, and mesopredator release.
Back to the Rock
Paine's plot is still mussel-dominated decades later. The alternative stable state held.
Count the ecosystem. Not the keystone -- the cascade.