Let’s not be so dramatic about a capitalist business decision to strategical maintain their market share. The computer wasn’t stymied and competition still exists.
There was a period of 10 or 15 years or so (up to around 2000) where the de-facto standard microcomputer operating system, supplied by MS, was much worse at using the hardware than it should have been.
(In the earlier part it wasn't able to access all the memory without jumping through hoops; throughout the period it wasn't using the available protection mechanisms to isolate processes properly.)
This was for business reasons, not because the human race didn't know how to write a better OS.
(I don't think this makes Gates an evil person, but I think it does make it fair to say that Microsoft stymied the computer revolution to some extent.)
It was an attack on the free market. Concerted effort to prevent better products from being available for sale. We lost a decade of progress, and never even managed to claw back the money.
Businesses in power want to remain in power and will do what they think is "right" to protect their position. I'm not sure how this delayed innovation, it just made it harder to compete in the existing market.
