Yeah it's always better to cover your bases. It's more of a money issue than a people one (as who would do that?) until... Like the waiters who have no problem splitting tips in a unofficial way, until one is given a lottery ticket that happens to win.The point is the difference.
When giving to an actual magazine you both waive the right and are asking for an answer.
With this game, they are giving a portion of the story/gameplay. Thus being a partial creator and can be due financial compensation.
However it is through patreon which isn't really selling a thing, so that makes it grey area.
I doubt the content creation would be any issue, until 20th Century Fox asks to buy the film rights on Heavy Five for 10 million, and then you see who comes out of the woodwork claiming a piece.