One of the things that bit one of our teams of developers for about 6 years was the Docker Hub pull limit -- poor configuration (established in the early days of the project), and no caching would occasionally break our builds for a day when we hit the pull limit (because of course lets base our multi-million $$ project on a commercial third-party that we have no contractual arrangement with). Encouraging them to get a proper tech lead to sort out these things was a major win for me.