The power is already in the hands of the player in the form of a tedious report function. This is not going to change the people who will abuse the report system anymore then it already is. The ability to report bots and how they make their gil should be an easy streamlined method and your logic does not make any sense. SE is not giving the player the ability to issue the ban. It is just another tool to inform SE to possible spots to look. If they delve into the log and see a 200 player FC with 10-20 people who like to farm and support the FC for a hour or two a night then they are going to not worry about it any more.

If they see 15 miners farming near 24/7 just mailing shards to a central banker character with multiple retainers then they may delve deeper and perform a bit more detective work. You sadly underestimate SE if you think they are going to blanket ban whatever a player reports.