Several years ago, a lot of F1 got NIW I-140 approved also. Recently, it is very hard. So it might has a little higher pos*****ility you got REF or denied if you applied NIW during OPT. But it doesn't hurt anything about your visa status and future application.
Just remember, you cannot NIW if you had already started or Perm application.
Just remember, you cannot NIW if you had already started or Perm application.