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You Can't Look at Porn on Any Reddit Third-Party App Now
(www.vice.com)
This is a most excellent place for technology news and articles.
Not just porn! Since reddit only has one such tag you can apply to posts, many subreddits were using the NSFW tag for a wider variety of reasons such as spoilers, content which may contain unsettling material (aka "triggers"), and more!
How does reddit tell the difference? Is it just nsfw communities not in the api or all nsfw posts? There is no discrepancy at least in the UI between NSFW gore and NSFW tits.
Also between the two I’d say porn is decidedly more advertiser friendly
They don't, it's any post or community marked with the NSFW tag
the OP literally said it's for all NSFW contents.