That's true. So using PyQt you likely need a commercial license for PyQt and not Qt. Alternatively, you can use PySide2 instead of PyQt to avoid this restriction, but it's less mature.
Less mature for the moment, but it's getting more official support and resources, so that will probably change. (They've also changed the name from PySide2 to Qt for Python.)
License-wise: "Qt for Python will have the same licensing as Qt for Application Development, i.e. it will be available under GPL, LGPL and commercial."
