Scam and phishing events happen constantly on daily basis, but the effect on someone’s reputation can be quite tough. Being an Artist and having an important follower base could make you a target for many kinds of “social engineering” attacks
Tumblr isn't just deleting porn, it's removing the roots of digital art; maybe it's not that important however, after all there's so much lewd art online that we'll have forgotten all about these artists in a few days.