Recently Fortnite also seems to be sporting a creative mode (where you can build without fighting/death), and support for custom-made games with custom rules. So maybe Fortnite can also be a creative outlet like Minecraft...
I believe that's actually the original fortnite. The story I heard is that all the "Battle Royale" stuff was patched in as a side project by a few devs, then quickly overtook the "real" game in popularity.
The original "Save the World" campaign is still a part of the game, and is not the same as the new creative mode.
Notably, "Battle Royale" is available on iPad and Switch which presumably captures the younger/more casual kids. "Save the World" however is not available on iPad or Switch.