>this subtly piggy-backs on it towards lock-in for tooling
FTA: "More than a dozen integrators have apps in GitHub Marketplace today, including Travis CI, Appveyor, Waffle, ZenHub, Sentry, and Codacy"
Travis CI and many others were widespread prior to this marketplace. Seems to me that creating a marketplace is a logical way to collect these third-party services in one place.
That's an oversight on Github's part and will end in a TOS change in one of two directions: price parity or complete prohibition of paid services that use GH integrations outside of the marketplace
FTA: "More than a dozen integrators have apps in GitHub Marketplace today, including Travis CI, Appveyor, Waffle, ZenHub, Sentry, and Codacy"
Travis CI and many others were widespread prior to this marketplace. Seems to me that creating a marketplace is a logical way to collect these third-party services in one place.