While I agree and assert the right of a server to enforce blocks and associate how they wish, I do not think any server has any responsibility to take action on their end to enforce a black that another server has done, nor do I feel it is ultimately appropriate for you to do so.  Moreover, it isn't feasible on any sort of scale, because all of your admin time at some point would be spent on accomodating to all the other instances, when it should be spent on _your own instance_ and _your own community_.  An instance admin's responsibility is to their instance first.

@moonman