https://killedbymicrosoft.info/ check this out. It gives us a great idea of what a monopoly is capable of but not any startups or SMEs. There are chances that some of these products failed due to wrong timings. But the failures are failures.
Even big companies fail. As per saying, Fail more, learn more. In a startup phase, it’s challenging to process failure, but once you are an established organization, It’s all R&D.
So in my perspective, a successful startup is a startup that lets you do R&D, which brings you the liberty to try something new and the liberty to fail.