Yes: not all code on GitHub is licensed in a way that lets you use it at all. People focus on GPL as if that were the tough case; but, in addition to code (like mine) under AGPL (which you need to not use in a product that exposes similar functionality to end users) there is code that is merely published under "shared source" licenses (so you can look, but not touch) and even literally code that is stolen and leaked from the internals of companies--including Microsoft!... this code often gets taken down later, but it isn't always noticed and either way: it is now part of Copilot :/--that, if you use this mechanism, could end up in your codebase.