an you legally revoke an adopt?
Well, no. Unless you have them sign a Terms of service, you really can't. Even if its used against your wishes, if there isn't a t.o.s then you cannot revoke an adopt. It is now their intellectual property, not yours.
The same goes towards gifts. The only time a gift can be revoked if it's a gift in exchange for a promise, like an engagement ring. So you cant legally revoke their design.
What about if its a closed species?
If they paid for the design, and you never said anything about the terms of service upon purchase, then no. If they arent aware of this and its nowhere publically accessible, then you can