I call it the "Laissez-Faire Gambit", as White captures on d5 and Black just "lets it happen".
Definitely dubious...black gains development in exchange for the pawn, but doesn't really get any initiative to make use of it, and White has plenty of opportunities to exchange pieces, shooting for a quick end Game conversion where the extra pawn could be decisive. Stockfish gives it about a 0.65, so there are worse openings out there. Great psychological weapon to use on someone who's hoping for an easy, drawish game with the Exchange French.
Many ways to break the symmetry. The fastest (and 100% sound) one: