@2unlimited: If you are employee in Poland the company employing you can also say goodbye and next. The only difference is that the politicians will be happy that you paid a lot more of your money to their budget so they had more to give to friendly building companies or to buy votes against your interests for your money.
If you are self employed the law of supply and demand apply just as much to you than any employed with the state as middle man. So they will not fire you if they need you, and if being fired is what someone with experience is most afraid of.... well it does not say much good about the person afraid to not pass an assessment at any other company. In a capitalist world if you are good & experienced for example a captain then you think "bad for them" and get self employed by another company and do your best so they are happy to have you there and do not wish to lose you (for example you are there after they call you when they need you for example because someone who should be there did not show up) and rather give you some extra money than employ someone who will for example not do so much for the company even if the other guy is cheaper because the cheaper guy can turn more costly the day when people call sick and there is no one who wish to come fly for example.
Of course all of this will only work if there is more demand than supply, if its the other way around no employee contract will save you cause the company will rather close down (happens even in Norway, especially when the state want "formueskatt" on machinery the company need and can not sell) than go bankrupt keeping people while they go in minus. Then they reopen in a different country or as a new company when the market turn around.