It's probably worth noting that some of those indexing efforts make more harm than good, there's a large chunk of Polish records which were "indexed" by people

It's probably worth noting that some of those indexing efforts make more harm than good, there's a large chunk of Polish records which were "indexed" by people who clearly have absolutely zero knowledge of Polish, and the results are SIGNIFICANTLY worse than any OCR could have been. Always compare to source material to avoid surprises like that.