Might not be the answer you are looking for, but there are several companies offering APIs to filter content. E.g. Microsoft has a Vision API. Per https://azur

Might not be the answer you are looking for, but there are several companies offering APIs to filter content. E.g. Microsoft has a Vision API. Per https://azure.microsoft.com/en-us/pricing/details/cognitive-services/computer-vision/ https://azure.microsoft.com/en-us/pricing/details/cognitive-..., it's $1 per 1000 requests (with the first 5000 being free). They also have PhotoDNA, which is free but does a subset of SFW. PixLab is another option (https://pixlab.io/cmdls https://pixlab.io/cmdls). Google has an API too (Cloud Vision). If you go down this path, you'll have to do your own research on which service works best and what you can afford.