There are many such threads, but this is one of the latest, which also has a dev reply and an explanation on why this can’t be done with Unity until Unity decides to implement this feature:
Until then, the solutions are simply using windows settings if all you want is a bigger cursor or Yolomouse if you want a different colour/render.
Yolomouse is the only allowed addon that the devs let you use, so you can use it without fear of being banned.