Basically I wouldn't trust any product to be lifetime unless the entirety of the software can be downloaded with its own license key and continues to work regardless of what happens to the company.
But at the end of the day it's free money. Sell the game exclusive on the console for a year or two and when it's back catalogue port it over to the PC and sell it again.
If KDE had proper human interface guidelines that didn't fit on a cereal packet and adopted a UX ethos & direction rather than a kitchen sink mentality then something might change. But it hasn't changed in decades so I won't be holding my breath. But if it were me dropping 1.5 million on the project that's where I'd be demanding the money be spent.
I would say that maybe if the devs followed the KDE human interface guidelines they might improve, but the KDE human interface guidelines are practically non-existent, about 7 pages that read like somebody's weekend assignment. Spend the millions writing some proper ones, and adopting it. It doesn't require KDE become GNOME, but GNOME has at least made the effort and despite your dislike, it is an slick, unsurprising, simple, forgiving and discoverable desktop.
UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. -- Doug Gwyn