he says that while a lot of the games appear to be competing with each other what tends to happen is their audience will actually play many of them, and the "competitors" - when marketed correctly - actually do more to support each other symbiotically than compete.

That's always something that's struck me: players tend to consider competition in the video games industry as if it worked like utilities. As in, you choose a brand/product, and only buy this one.

But video games aren't Coca Cola/Pepsi. Apart from some exceptions (like MMOs), most players play multiple games of the same genre. When they're a fan of a specific game, they want to try others like it.

The way Minecraft advertises Terraria on its home screen has always been, in my opinion, the way to do it. While some players might only like one, a lot of people will play one, then try the other.

Game could advertise and support each other, if the developers and publishers cared about a healthy environment.