I don't use e621. I don't have an account there. If any art that I've paid for is posted there, it was not posted by me. I have just submitted a request to have any of my commissions that I have paid for removed from the site per their own takedown policy. This is only relevant as certain artists I commission do not wish to have their art posted on e621. As I don't use the site at all, it is easier to request that anything of my characters/commissions be removed than to track the individual ToS of each artist.

Edit 7/15/20:
I have received feedback from e621 that the takedown request has been submitted and acted on. The site owners have been prompt and respectful to me, so it is a disappointment to see site USERS become disrespectful (mostly in private IM). Please don't be that guy. I've been around on the internet and within the furry community for a LONG time.

There is a DNP application that I have submitted as part of the takedown request. I'm not sure how that will go. This is NOT for all art of my character. This is for art that I have created. Yeah, it's buried back there, and some of you don't have view permissions. But it IS back there. I have at least 2-3 pieces I've made solo and at least 2-3 I have collaborated on with other artists. I am also careful to curate which artwork goes onto the publicly facing sections of websites that I put up myself (currently all servers are powered down for cost reasons), which typically includes either content I create myself or content that I pay substantially more for additional rights to.

Be nice to each other,

Eiko