Foreign investment isn't fake growth and money being spent in the country is definitely a good thing. It's how Singapore managed to kickstart its economy in the 1960s. Lee Kuan Yew tried very hard, and succeeded, in getting foreign corporations to set up shop in Singapore. The key is to capture value and move up the chain over time rather than getting stuck as a "cheaper back office".
Yep, and today the situation is completely reversed. Through acquisition and business development Singapore is the country which owns the brands and invests in other countries. Poland just needs to stick to the formula. It's citizens are building global-class professional, managerial, and business development experience. Soon if not already those employees will start itching to build their own businesses. Poland just needs to maintain a competitive environment, and not let international companies suppress local startups by lobbying for anti-competitive laws and policies that favor the big guys, foreign or domestic. If it wants to give local companies a leg up, do it indirectly by investing in education and research.