Is there a good explanation somewhere as to what someone can and cannot make/sell/open/close with Qt? Last I saw, platforms that allow precompiled dynamically-linked libraries (i.e. everything but iOS) could have the LGPL stuff in a separate binary file. But if you linked the code in directly, you couldn't distribute your application without the source.

I wish there was a FAQ with easy answers like "If you write an iOS app with Qt, you can close the source if you pay us a license fee" or something along that line.

IIRC, Xamarin had similar problems, but that went away when they were purchased.