The micro-transactions barely exist and was easy be bought with premium currency found in the game. There are paid battle passes but none of the items within give you much of an edge over anyone else, and those battle passes also award premium currency which can be used to buy the next battle pass. They’re not timed, either. You can buy one battle pass and sit in it for a year before completing it.
As far as MTX go, they’re the most inoffensive I’ve ever seen in a game.