Qt is LGPL. You know what else requires you to respect the LGPL ? Electron becauses it is built mainly on LGPL components (Blink, FFMPEG to name the biggest ones). If you are ok with the license of Electron you are ok with the license of Qt.
https://github.com/electron/electron/blob/main/LICENSE
So everyone can use it without the need to expose his IP.
See for instance one of the most core Blink data structures: https://chromium.googlesource.com/chromium/blink/+/refs/head...
That is the exact same license than Qt, you do not need to expose your IP when using it (Tesla used LGPL Qt for their car dashboards and you don't see that IP floating around on the internet)