Current judicial situation in Poland is how it is hence OP might not know what the problem relates to. Polish prosecutors can do whatever they want and have no oversight.
Not necessarily, as I mentioned prosecutors in Poland can do whatever they wish so all you gotta do to be under investigation is to have larger amounts of money or piss off somebody with friends.
you don’t, just run away with whatever you can, it’s not worth it even if you did nothing wrong. They’ll drag you through dirt and leave you with nothing but a penny. The lawyers in Poland are friends with prosecutors and judges, there is no secrecy, if you did something wrong and admit it to the lawyer they’ll rat you out. There is very few law offices that could potentially help you but those are literally the best in the country and will cost you a hefty sum. As mentioned before, best you can do is take what you can and take an L, if you want to do business in Poland again you’ll have to set up a company using somebody else because you’re officially burnt.