I've had it an admin warning twice on Pixiv, basically it states that unless you censor the work it will be made invisible to other users.
Both times I did receive it in English, which is handy.
imgur.com/H8pwYUI

If you are a normal user, this means losing all faves, comments etc. on your work either way, since you can't 'update' an image with a new version.
Premium users are kinda in the clear on that matter, as shown in the warning.

It sucks, but it's Japanese law after all. Things aren't allowed to be uncensored even outside of Pixiv....
So far though, only two of my uploads had to be censored, while the other I uploaded even after the warnings remained untouched.
(I guess it does still put me at risk uploading uncensored stuff if they look at my warning history, but oh well...)