Other than Ikea, why would a company run this as opposed to Linux or whatever? I understand clustering is cool, feels like a mainframe of sorts, I can probably

Other than Ikea, why would a company run this as opposed to Linux or whatever? I understand clustering is cool, feels like a mainframe of sorts, I can probably come close to that with kubernetes. What are the other compelling arguments, there is no software for this platform that isn't readily available for Linux. ELI5 me.