Imgur blocking Adult/NSFW content is most likely influenced by their monetization strategy.
You know why they (and Tumblr/IG) want to block Adult/NSFW content?
Ads. Advertisers don't want their ads (and brand) to be associated with adult/NSFW content.
We aren't beholden to advertisers, and embrace freedom of expression. We have no plans to ban NSFW content.
Tumblr committed suicide when it banned NSFW stuff. It will be the same with Imgur.
@newsorpigal news of tumblr's demise is vastly, vastly exaggerated. in fact, it was one of the best things to happen to the site from my perspective as a relatively late adopter, because many of the assholes left while a higher proportion of introvert art kids stayed.
also, nudes are back, though hardcore explicit content is still banned.
pixelfed
newsorpigal
deutrino