I am not sure where you got such a negative view of the technology lol.  On top of a decent ad replacement imo.  I have seen someone have that either set up the page or was going to, that has it donate to NORML.  So another use would be charity.   Another idea is if Wikipedia were to implement it, it could run properly without worrying about donations.  I think there is a lot of positives that could come, instead of focusing on the one negative of a botnet abusing it, as a botnet can abuse a lot of good things, doesn't mean they shouldn't exist imo