[jerf]

"It's locking literally every individual and business out of a "development" domain, solely for one corporation's for-profit use. Solely to associate Google with development, over any other corporation in the world."

You have answered the question "Was this selfish behavior?" or "Was this an asshole move?", with an answer I agree with. But that was not the question. The question was whether this was monopolistic behavior. The answer is no. As far as I know, several other TLDs have been similarly locked down by companies with no claim to monopoly power in any industry, which pretty much proves it's not related to monopoly power.