There is a substantial amount of spam and NSFW posts on the All page coming through already. Most NSFW posts aren’t being tagged as such and are coming right through. I am not sure how this can be weathered but we need something in place fairly soon, I feel like we are days away from rivers of bad stuff, especially via some of the federated instances.
EDIT: I personally don’t care much about the NSFW aspect, more in the lines of what a newcomer will be seeing when they get to the main page. 99% of the newcomers don’t know / care about federation and have no idea how to turn that off. Liability for the server owner is also an element of consideration.
If posts are tagged nfsw, then they’ll be blurred, but unfortunately people aren’t consistently using the nsfw tag. Most of the nsfw content is coming from lemmynsfw.com - I’ve asked one of the admins over there if they can just auto-apply the tag to any post on their instance with media attached.
They replied that they are looking into it.