Is it possible to "hack" a MacBook so as to be able to install macOS Mojave?
macOS Mojave requires Metal support. Apple is justified to prevent installation on older models because they literally do not have the capability to render the GUI.



Edit: A recent upvote has reminded me about this answer. I'm appending this section to say that an inability to run Mojave is not entirely the case. Mojave still has software rendering for Recovery Mode. AnyOS'll Do's answer is not entirely wrong, despite most of the answer being assumptive.

This answer links to a tool already in existence (that has been brought to my attention before, although I didn't think much of it) to enable installation of Mojave on unsupported Macs. The only catch is that hardware acceleration will be disabled, since hardware acceleration for old GPUs has been dropped.