Considering M$ has the advertisement deal for Anthem, I am quite sure this was done on purpose to have something to counter Days Gone. My money goes to Days Gone, l will buy Anthem later (if it is good) in order to see if the game will have eventually some sort of micro-transactions or not
I could actually see that happening as well, the whole MS trying to counter Days Gone thing.
I feel like more people are skeptical about Anthem though and are waiting to see how it turns out, so I think Days Gone will be more successful by a large margin. People are skeptical of it as well, but for different reasons that should not affect it too much in an otherwise slow month anyway.