The alternative for eastern Europeans always was to go to UK or Germany and be a fungible labour there.
Current strategy increased quality of life in EE countries. So far that in main cities in Poland housing prices are 4000-5000 USD per square meter.
And while it's better to be with work than without, living paycheck to paycheck in fear is not that great either, and doesn't exactly provide ways out. So sometimes we're left with just what solidarity we can arrange without legal representation, like the time entirety of one of my former workplaces left the job one day for what american management did to one of them.
Poles are entrepreneurial and forward thinking nation that will sooner or later become economically as prosperous as WE.
We on the other hand will always be discount version of Austria/Germany.