In the Trolltech days, Open Source Qt was GPL-only. And up until Qt 4, the Windows port was Commercial-only.
Nokia introduced LGPL and open governance, simply because they were not interested in Qt as a commercial product, and The Qt Company is now trying to build a business around this. With huge companies like Tesla building their product around the free version of Qt without complying with the open source licenses, it is not that hard to see why they would look for ways to find out who their actual users are.
"It also allows us to initiate a dialogue with commercial companies who mostly work with open-source versions of Qt."
Open source is free lunch. You pay for it by engaging with the community. So requiring nothing except a login for binaries, which does come at an actual cost for the company providing them, is a pretty fair deal.
Nokia introduced LGPL and open governance, simply because they were not interested in Qt as a commercial product, and The Qt Company is now trying to build a business around this. With huge companies like Tesla building their product around the free version of Qt without complying with the open source licenses, it is not that hard to see why they would look for ways to find out who their actual users are.