Here's a blog post where I explain my motivation for creating the program - https://raskie.com/post/practical-ai-autodetecting-nsfw. There are some hyperparameters to tune, but you're right, it's extremely flaky. Part of that might be down to my work (I personally wanted the app to be prudish enough to flag the Baywatch intro), but the off the shelf model I used for this, does produce some strange results. Kind of wanted to use this app as a convo piece to discuss AI with people who aren't entirely technical, or with technical people who wonder what AI can and can't do.