It was last year(2020). Qt announced that it won't provide LTS to its open source editions.
https://www.qt.io/blog/qt-offering-changes-2020
And this year(2021), at March 4th, Qt 5.15.3, the first LTS only for commercial users is released.
https://www.qt.io/blog/commercial-lts-qt-5.15.3-released
Of course the replies for this post are under flame war from open source edition users. They say that Qt user base will shrink, the company has started the first nailing to its coffin, ...... and such. Well, the blog evokes flame war from time to time so I'm just watching it with my popcorn.......
But let's sit down and think. Would the policy of "LTS for commercial clients only" shrink the general user base for Qt? In my thought, it's absolute NO. Let me ask you one question to make it clear.
"OK. Say, let's not use Qt. Then what will we use?"
As far as I know, there's no such library which can fully replace Qt in 1 on 1 way. Some features would be able to be replaced, but Qt-only features are not replicable at all(hey, if you think you can replace Qt Quick with Electron, how would you deal with that RAM consumption?), and if you're joining some other ecosystems, chances are that the difficulty for maintenance will rise exponentially. And say, among those "alternatives," which can provide at least a good match in terms of commercial-level documentation and consistency in API structure? wxWidgets? Hey, I saw so many news to migrate from wxWidgets to Qt but not in the opposite way.
Think of it. When a new language is created, one of the external libraries bound to that language ecosystem at the first time is Qt, which shows what Qt is among developers.