...The engine gambit books are made in such a way that 1) real lousy gambits are not played, and 2) the book is choosing a gambit line as often as possible, so for Black it might go for e.g. a Benko gambit or so
and if you let it play with White, a lot of 1.e4 gambits can be
played. Thereby, if you try a gambit yourself, the program might
try to a counter-gambit (or sometimes an unconventional
line). It will play weak against other engines, and it not meant
as to play very strong/perfectly, but for human opponents, the gambit lines
will most often result in entertaining -not boring- games, and require
quite some concentration to avoid tactical mistakes.