[mdeg]

Custom map technically, although the WC3 map editor let you write custom code so the line is kind of blurry.

[k__]

Sure.

I just had the impression DOTA was made by some guy who wanted to make something like DOTA and Fortnite was made by some people who wanted to make some mix of L4D and Minecraft, but pivoted to doing something like PUBG instead.