@PepeMaster : Depending on how strong your opponent is, you can have different hopes. For example, I played the grob (1. g4?!) against a person I know (in real life), with the hope of winning the opponent's rook (it worked really well). Black resigns at move 5. So, perhaps it is a gambit, because I sacrificed two pawns in the hope of winning a rook.
lichess.org/ThJ4W9I8/white/analysis#0
lichess.org/ThJ4W9I8/white/analysis#0