You have to squint really hard to see "many reasons". Look at the list of sites it checks. Porn / fetish sites, gambling URLs, photo hosting, hobby forums, etc. It's a tool for doxxing and stalking, and little else.
It's essentially like arguing that releasing open-source ransomware toolkit is beneficial. I mean, maybe it's your right, and one can make some strenuous arguments about how it helps the "defense", but really, it just makes it easier to be a terrible person on the internet.