In general, competition is good ... but not always, and usually one does not want competition on standards - rather the opposite, it's very often nice if competitors follows the same standards as that makes it easier to replace a unit. As a small example, USB has become the norm for power delivery to almost all cellphones (at least here in the Europe - thanks to an EU initiative) - it's certainly not the best standard for this purpose, but it's a hell of a lot better than how things used to be - different plugs for every cell phone model almost.
Exceptions does apply though, old or bad standards can become a barrier for innovation - and proprietary de-facto standards can really skew the competition. If 95% of the population is comfortable with receiving and sending Microsoft Office attachments by email, it's very hard for anyone to compete against Microsoft Office (and very hard to be one of the 5% that doesn't like Microsoft Office).