This is not the atitude an open source developer should have toward the community: publish the standards, specify them. Open source software's, or more clearly, libre software's (although I understand that Apache 2.0 License is a lesser general license, not those copyleft ones.) purpose is to make things open and reproducible, not just irresponsibly marking all unofficial builds unsupported and even trying to build a barrier to stop any other people packaging unofficial versions of the software. The developer is violating the core values of open source.
Comments
This is not the atitude an open source developer should have toward the community: publish the standards, specify them. Open source software's, or more clearly, libre software's (although I understand that Apache 2.0 License is a lesser general license, not those copyleft ones.) purpose is to make things open and reproducible, not just irresponsibly marking all unofficial builds unsupported and even trying to build a barrier to stop any other people packaging unofficial versions of the software. The developer is violating the core values of open source.