Yes, Trolltech/Nokia/Digia did and do want to sell commercial licenses for Qt. They wrote and write most of it, after all, and they need to make money. And the LGPL doesn't allow what Digia wants to do, as it would force their customers to release changes to the source code of Qt they use.
OTOH, other companies can and do the same with other open source projects like Apache, X11, BSD, etc., because those licenses allow that without needing something like the CLA, but then those have the disadvantage that others can do the same, and indeed that's not what Digia want...
So what you get is a hybrid proprietary & open source ecosystem, where Digia profits from the proprietary part and others profit from the open source part, and hopefully both profit from each other.
They are a company that happens to release some of their code as open source. And I doubt they want to be described as an "open source company", but hopefully they want to be consider "open source friendly" to some degree.



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