Having and hiring your own expert to negotiate helps.

But shining some very bright sunlight on practices and abuses helps as well. The more Amazon (and its recruiters) hear "I don't work for assholes", the better.

Markets rely on well-informed participants.

Also Microsoft. And, on different grounds, Oracle. And Google, Intel, Cisco, and Apple ("anti-poaching" market collusion -- the case is still ongoing AFAIK, though I've not been following closely).

I've many reasons for avoiding the industry, but these are among them.