Related: Qt disabled downloads for anyone that has a Belarus or Russian IP-Address. There are talks about why they blocked it currently going on at their public mailing list[1]. One argument that came up, is that the downloads are blocked, because Qt is also used in the military. My guess is that this will definitely strengthen other UI toolkits like Flutter in the future.
[1] https://lists.qt-project.org/pipermail/development/2022-Marc...
Flutter is not an alternative to Qt, not even close. Not to speak about C++ compatibility. If anything, things like GTK+, WxWidgets, EFL are on the same page, albeit less polished and advanced.
[1] https://github.com/fzyzcjy/flutter_rust_bridge
[2] https://docs.flutter.dev/development/platform-integration/c-...