It's the same principle as with the largely family-owned German Mittelstand - so many of these companies are "hidden champions" are where they are because their leadership / ownership doesn't have to bow to the will of some obscure "committee", but can do what they feel is right for the company and will ensure its long-term success.
In contrast, transferring the trademark to a committee-run foundation (or to go into economy analogy again, a company that's traded on the stock market), the incentives for those in control can drift: short-term profit wins over long-term interests (e.g. trust of the public). We've seen way too many organizations in the FOSS world fall victim to that, most notably Mozilla and MySQL - the former is always embroiled into some sort of scandal and Firefox usage has fallen through the floor, the latter was mismanaged by Sun and eventually Oracle so hard that its co-founder was forced to fork off the codebase.
"Design by committee" is a great way to create something that works for a lot of people, but is average at best. If you want to create something that really excels, you need someone to drive home the vision and that's really hard to do when you're more than one, because it's really hard to be 100% on the same page.
Not to say it's impossible, it's just a lot harder.
