This Is Why Not All Machines Use The Exact Same Espresso Pods - Tasting Table
Briefly

Keurig and Nespresso coffee pods are not interchangeable due to significant differences in size and design. While K-Cups measure approximately 2.08 inches in diameter, Nespresso pods are only about 1.45 inches wide, making fitting one into the other impossible. This incompatibility is reinforced by recent devices in their machines that read barcodes on the pods, refusing to brew if the pod isn’t recognized. This strategy helps maintain exclusive pod sales, which is crucial to both companies' revenue models, despite causing frustration for consumers who desire alternatives.
Keurig and Nespresso pods are not universal; their differences in size and design prevent interchangeability, serving companies' revenue interests by ensuring customers purchase their specific pods.
Keurig K-Cups measure about 2.08 inches across, while Nespresso pods are around 1.45 inches, making it physically impossible to fit one into the other.
Both Keurig and Nespresso have implemented barcode readers in some machines to ensure they only recognize their branded pods, creating a 'gate-keeping' mechanism that's often frustrating for users.
The design choices of Keurig and Nespresso stem from their business models, which rely heavily on revenue from pod sales, maintaining unique and non-interchangeable pod designs.
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