Since your bank reimburses ATM fees, the main thing to worry about is conducting the withdrawal transaction in local currency rather than dollars.
I have definitely run into fee-charging ATMs in Poland. When I went to Czechia in 2018, I had the unpleasant experience of encountering at least two ATMs where the transaction (withdrawing about $40 worth of currency) halted when I refused the DCC offer and opted to conduct the transaction in koruna. I suspected the ATM owner didn't want to give me currency when it was not going to make a profit off of me. That is just my supposition, of course; it could have been a case of empty ATMs, despite the timing of the error message. In any case, I learned to allow extra time to find a worksble ATM. I would guess there's less need for cash in Czechia these days, so you may only need to find a good ATM once.