As someone else has said, the alternative isn't to move away from GH (at least not for this specific issue). The alternative is to change your license to not allow for this.
If you change your license to exclude this particular use, it's no longer Open Source (no restrictions on how it's used).
If you change your license to forbid removing the license, then there's a good chance that it doesn't hold any legal power. Reason being that machine processing is allowed by copyright laws.
If you change your license to forbid removing the license, then there's a good chance that it doesn't hold any legal power. Reason being that machine processing is allowed by copyright laws.