Pretty safe considering it won’t allow you to view any objectionable material until you purposefully tell it to do otherwise. Thus, unfortunately, this data is completely pointless.
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Errata: The last factoid is incorrect. The number of “Safe” artwork actually rises to 96,1%. Third factoid likely overshoots due to lack of “Junk” filtering; it’s probably closer to 82,3%. They told me not to math, but I did it anyway.