So blu isn't the problem, the particular players are. And denial of resources to other players is harassment/griefing and reportable under the ToS. Just start reporting the people who refuse to play nice. They are not allowed to do that., they agreed not to when they signed up and agreed to the ToS. You can attempt to talk it out with them, explain your side, and they can agree and be decent people. Or they can get banhammered.

Seriously. Reporting is not harassing someone. You only have to report because they are harassing you. If they didn't want to follow the rules, they could have chosen not to agree to them. They can uninstall at any time. They signed a contract, they refuse to uphold their end at their peril.