Redistributing modifications or otherwise modifying, improving and sharing software isn’t stealing…
Their “exception” basically defeats the point of the free license it uses (Apache2.0). It’s more source-available than libre or open source, thinly veiled by the Apache license at the top of the project. I find it interesting that they chose a free license to base it on in the first place if they then go on to invalidate a good chunk of it’s user protections.
If they really don’t want people to pass off other work as theirs, they could have just used the 4-clause BSD license, with it’s advertising clause, or Apache 1.0, also with an advertising clause (not great for libre licenses, but would fit and wouldn’t be quite so bad as what they’ve done).
It’s a voxel engine. It’s not anything on it’s own, but it’s made to be extended with games and mods to become you want it to be. And if you play online, the server will send all of this to your client, so you don’t have to download everything it uses.
It’s also not a “clone” of Minecraft, it doesn’t try to be Minecraft. Well, one of the games people made for it does but the base game itself isn’t.
It’s been around for a long time, since around 2010.
Huh, I had no idea OpenBoard was discontinued