Yes. NSFW tags allow images to get blurred or not listed in a feed by apps. This post is still going to roll across All and not get filtered because it isn’t tagged.

How visible this post is on someone’s phone is variable. It could be a tiny thumbnail, or take up half the screen. While this post isn’t full nude, it is still could easily be considered NSFW.

Yeah I was looking at Lemmy before a lecture and that image took up half my screen. If you’re in doubt it’s best to just tag it.