Isn't it simply because it has no regular service intervals at all so EVERY time it goes to service, it's because of some fault? While other cars have the faulty components changed during at least annual, and usually more frequent service (normally it's 1 year of 15K km whichever comes first), and it doesn't count as a fault?

Here in Cyprus, there is no Tesla service and no one knows how to fix them. So people just buy them and drive until they break. Not possible with any gas car.