That is however, not a reason for the lack of mod support in general.
The fact is, that if you look at the way Starcraft II maps are regulated and the omission of LAN, its quite apparent that Blizzard simply wants total control over every aspect of their product and to make sure that absolutely no one other than them can in any way profit from their product.
They are of course fully within their rights to do so, but when its justified with the ridiculous: "its all for your own good" corporate PR lingo it just leaves a bad taste.
Indeed. If it were Homeworld 3, and BG3 and was favorably received I'd probably do the same.
But the industry did lose about a dozen purchases from me [not that they're gonna lose any sleep over it] over the last few years, because games in general fall into the: "I'd play it but I'm not dying to" category, and faced with these schemes, I just opt out.