how do anyone know when u enter a sweepstake or contest u used a robo fill or any automatic entry system?

Answer 1

That does not make any difference. Your same small chance of winning a random sweepstakes doesn't depend on how you completed your selections.

So no one will bother to know. If you win a large enough jackpot to be interviewed on nationwide TV you can brag about your selection method. If not no one will want to hear about it.