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It’s presumably to give you legal ground to sue if some corporation scrapes Lemmy content and uses it to train AI, or whatever other commercial purpose.
Hopefully if enough people do it they would consider the dataset too risky to use. They could try and parse out comments that have that license statement but if any get missed somehow they open themselves up to lawsuits.
That would force them to instead pay for content from somewhere that has a EULA forcing the users to hand over copyright regardless of what they put in their posts (i.e. Reddit).
One nice thing about KDE compared to most of the other DEs is that the window manager (kwin) is separate from the underlying components, and it can be replaced!
There are many walkthroughs like this one out there: https://github.com/heckelson/i3-and-kde-plasma
You get i3 for tiling window management but you still get to use KDE’s system settings to do configuration like display settings, themes keyboard shortcuts, etc, just like you did before. You can also pick and choose which parts of the KDE desktop you want to keep (menu, krunner, etc)
Since i3 is just a window manager and is lacking all of that system level stuff it really rounds out i3 to feel like a full DE instead of having to piece together other tools to do those things.