Lichess says that englund Gambit is blunder.

I don't understand why lichess engine recommend englund Gambit a blunder, instead of book move
Please anyone can explain.
Here is one example of my game-

@TRULYFACTs25. It's a blunder because white can keep the pawn with no issue.

"The winning of a pawn among good players of even strength often means the winning of the game." - Capablanca
Hence "All gambits are unsound except queen's gambit"
This being said, you can play Englund Gambit, enjoy it and even score with it against lesser and unprepared players. Forcing your opponent to think of his own on move two may be worth giving up a pawn.

Lichess does not use the "book move" like chess.com, It just evaluates the move on its own, Even pretty common and (by most players) respected openings like the benoni, scandinavian, and alekhine defense will be considered an inaccuracy because objectively speaking there are much better moves in the position...

After 1. d4 1...e5 is objectively speaking one of the worst possible moves in the position, The theoretical main line leads to a winning position for white after the complications, And if black does not follow the main line white will be able to keep the pawn without much trouble and black is left with little to no compensation at all.

At high levels of play the Englund gambit is probably a forced win for white and that is why it is considerd a blunder.

The only reason to play the Englund gambit is to try and trap your opponent with one of a few possible traps avalible from within the gambit.

If white is familiar with the gambit and knows how to avoid getting trapped there are 3 possible outcomes:

1. You are down a pawn without any compensation
2. You "win the pawn back" on b2 but this will give white a huge lead in development and a much better position
3. You sac the queen for 2 pieces.

All these options lead to a much better (if not straight up winning) position for white so technically speaking you do indeed blunder the game on move 1 :)