Half a million?
How many people are using KDE nowadays? And how many known VLC deployments are there? Surely there have to be more than that?
App and UI framework Qt is finally coming to Android and iOS in the form of Qt Mobile Edition, allowing cross-platform apps to take their GUI from desk to pocket for only $150 a month. Unveiled at the Qt Developer Days in Berlin, the Mobile Edition provides everything the Qt developer needs to get apps onto mobile devices – or …
Qt is available under two licences commercial and LGPL. They're probably discussing commercial deployments.
That is going to be wildly popular.....
Support, costs.
There is also the free Qt Project version, sans support.
If you want your hand held, hand over the $150/month. If not, download away and find your own solution if/when problems crop up. This has always been the Qt approach, two versions, one free, one not, nothing new here.
You could also compare this with the Xamarin Enterprise license which costs $1800/year, so it's in the right ball park if you're that category of developer.