There are multiple levels of duping.

Now that the cat is out of the bag so to speak and the PUA game is well known, I've found that many women are actually surprisingly interested in it. To the extent that PUA skills increase unconscious signals that women find attractive, it may have a net benefit for women by upping the typical attractiveness of the dating pool, as Sarah points out. It could have an effect like tasty but safe artificial sweeteners, or widespread effective invisible makeup and cosmetic surgery.

That level of false signaling is probably harmless and even net benefit for women, but the aspect that many women rightly dislike or hate is the darker side to PUA which focuses solely on manipulating women into one night stands using whatever techniques work - which mainly includes alot of bullshit and dishonesty.

So it depends on what exactly is being faked and to what extent. As we all know men have less risk with casual sex, have higher net demand for it than women, and thus women have to be more choosy in finding mates. PUA 'dark art' persuasion techniques thus give women legitimate reasons for concern. (and reasons to be familiar with PUA game in general).