I don't think anyone cares that Malwarebytes supports/does not support Server systems, the problem is that the code for the installer was changed to directly NOT support Windows Server machines, which is why your customers feel cheated. Why was the decision made to change the code and disallow it from installing?
I know I feel cheated as I do not care that I have an 'unsupported product', I just care that I purchased Malwarebytes when it first came out like, a decade ago, never had any problems installing it on any of my operating systems and now suddenly with this modern crap '2018' edition, we cannot. Less functionality, more modernism, more problems is always the way modern software seems to be going and it is very, very disappointing that Malwarebytes is taking steps to ensure the trend with their software as well.