Their messaging on that can be a bit (probably intentionally) unclear sometimes (and from what I hear they have pushy salespeople), but many companies use it successfully under LGPL terms, and for typical desktop apps the compliance effort isn't that large. (embedded devices etc are a different problem, I suspect that's where they make most of their licensing money)

They also are providing a lot of value to the open-source communities building on Qt, so I don't think they are a great example for what GP mentioned.