How to decide what to build, what to buy, what to access through partners, and what to participate in through ecosystems — covering differentiation vs commodity analysis, vendor evaluation, total cost of ownership, interoperability velocity, exit strategy, and lock-in risk.
...commodity, everyone needs it → Buy (Auth0, Cognito). Payment processing — commodity with regulatory complexity → Partner (Stripe, Adyen). Logging and monitoring — commodity, solved problem → Buy (Datadog,...