I agree it's unfortunate that Unreal Tournament got canned, but devs can projects all the time. It's certainly not specific to Epic. Apparently, Valve constantly abandons and cans stuff internally, you just don't hear about it because they don't talk about their projects. So basically, you're criticizing Epic for being more transparent than Valve.

Clearly devs are knocking down the door to be on their store. You were just saying how the developer of Assault Android Cactus wanted to be on EGS but Epic wouldn't accept them.

The only reason Unreal Engine isn't competing with Valve is because Valve has fallen so far behind in engine tech they simply can't compete.