Well, its actually more like "Apple more like Linux," as Apple are now building their OS on UNIX, where Linux has been for years...
Just like when they moved to Intel processors.
Its good marketing to have a billboard that says: "What's an Intel processor doing in an Apple? More than it ever has before." But when you remember that Apple's performance with PowerPC processors (not to be confused with IBM Power processors) wasn't good, so its more like: "What's an Apple doing with an Intel processor? More than it ever has before."
Apple makes a good OS, but I've seen shenanigans with that too. And besides their OS, they sell the SAME hardware (processors, memory, hard drives, etc) that everyone else does. Apple did not seem to understand what a server is meant to be, which led to them having to terminate their line of shiny XServes. They make good consumer oriented software, tailored to specific hardware configurations.