FF7 Director, Kitase in a recent interview:
“While we are satisfied that we’re meeting a certain number of sales, with the current modernization state of games, we cannot be exclusive to a single platform. I think we need to [be able to] offer the game to as many players as we can.”
Someone else on the FF7 Remake dev team I believe said that they are looking forward to offering the FF7 Remake series on other platforms.