I believe you mean 4. Bc4, but yeah, that gives black a huge lead in
development for the pawn either way.

Of course, most games between class players (2000 ELO) are decided by
middle game and end game play, especially tactics. So there are plenty
of openings like this that a grandmaster would never touch that are
perfectly playable for us amateurs.

And, in this case, the psychological advantage of making your opponent
think you're a total patzer, and that they should be able to refute
your opening, might actually be useful. I've seen many people lose by
overextending their position while trying to refute a theoretically
unsound, yet still playable, opening. I even did it once or twice
myself before I realized that the refutations to bad openings often
involve long term advantages, not necessarily something that can be
immediately attacked.

--Richard