I'm curious how much experience you have personally with parents who come on this board or perhaps Poland in general just to birth their foreign children in Poland for citizenship?.
Not Poland, but google the Chen case for more. In a nutshell, it was known for mothers to travel to Northern Ireland to give birth - as the child then had automatic Irish citizenship (due to the then-in force jus soli law regardless of the legal status of the parent(s)). It was then ruled that the parents had the right to stay in the EU to look after the child, which was an Irish and by extension EU citizen.
But yes, it's also not unheard of for Americans to think that their child being born abroad means that it's automatically a citizen of the country in which the birth took place.