That doesn't even make sense, how is blackmail involved?
You may not agree with a tax, but that's what voting is for. If it passes, you pay it or you remove yourself from the jurisdiction...that's not blackmail, it's how taxes work.
Hopefully that move is to somewhere close by; else, that kind of black-and-white logic would directly result in 45,000 Amazon employees facing either relocation or unemployment. Even then, the added time and monetary costs of added commutes can put folks in a similar "between-rock-and-hard-place" scenario.
In general, telling someone "if you don't like it, then move somewhere else" betrays a complete ignorance of the economic and psychological burden of doing so (burdens which not everyone can afford). Amazon itself can afford to move with relative ease, of course, but that doesn't hold true for the vast majority of its workers.