but that's only at the behest of the author. it can not be made a condition by the recipient, but that's what would be necessary if the goal is to prevent abuse

but that's only at the behest of the author. it can not be made a condition by the recipient, but that's what would be necessary if the goal is to prevent abuse of contributions for self promotion. the author can always deanonymize their contribution at any later point. right to self promotion is a core feature of copyright law that can't be circumvented.