I don't think it is censorship if you are asked to simply proclaim the right topics for your post and not abiding by rules and being called out for it I don't consider censorship either.
Let's just try a little example:
A company is selling sweets. On the packaging it says chocolate eggs but inside are gummy bears. A paper now calls them out on it and their sales drop. Would you consider this a form of censorship because the freedom of the company is taken away to sell their gummy bears as chocolate eggs? (I am specifically assuming in this case that no consumer protection steps in and actually forces them to take the product off the market because that would be a kind of censorship if it was valid or not is a completely other discussion. I am just assuming that because the newspaper called them out their sales drop massively)
In my opinion this is what applies if you falsely tag a food picture as bitcoin related or don't tag NSFW content as such. Maybe the system needs to be changed meaning in which ways you are able to call someone out over such a thing but I think you should be able to.

Edit: also I wouldn't worry about NSFW pictures when I am around my friends we would look at them together but sometimes and especially me working at a bar I am around customers or my boss while I am not working and that wouldn't make too good of an impression.