Why Giveaway instead of Antichess

they added the antichess under the name of GIVEAWAY this is unacceptable

Giweaway is one of the names of this chess variant. And it is better than Antichess, because it hints what you should do. You should give all your pieces away to win.

While Antichess says "it is anti-", but what exactly does that mean? Perhaps anti- means: you should force your opponent to checkmate your king? Or maybe pawns move backwards? Or maybe you can capture your pieces, but cannot capture opponents'?

Antichess, is giveaway it the same. On lichess is call antichess but original on  FICS is call suicide chess there is another variant call loser is similar you can't capture the king and you can allow to castle if your king is in check have to move.

Antichess is just a remane of Giveaway