There is a need to prevent spam, which has been undertaken to destabilize the network for some time. Blacklists have enabled the network to continue to function despite such attacks. However, blacklists are presently only optional at the point of front ends, and users themselves do not have any control over what is filtered from their feeds, other than by choosing which front end to use (and I believe all popular front ends provide the same filtering at present).

Enabling users to choose from available blacklists would distribute that choice of filtering, while maintaining the ability of the network to prevent destabilization. Your feed is filtered by blacklists now. This idea will allow you to choose the conditions of the blacklist that filters your feed, which is currently not available to you.