Some of these issues seem like they could be addressed by in-house people at Reddit better than people on the outside - and I'm pretty sure they're already doing some stuff. One could identify clusters of users who 1) usually only vote for one another's stuff, 2) Vote up things most users vote down, and 3) Link mostly to 'bad' domains and rarely comment. These users could then be screened by hand, and hellbanned. This is the sort of thing that I would start with aberrant voting data though - and that is probably not public for the malicious bots.
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Some of these issues seem like they could be addressed by in-house people at Reddit better than people on the outside - and I'm pretty sure they're already doing some stuff. One could identify clusters of users who 1) usually only vote for one another's stuff, 2) Vote up things most users vote down, and 3) Link mostly to 'bad' domains and rarely comment. These users could then be screened by hand, and hellbanned. This is the sort of thing that I would start with aberrant voting data though - and that is probably not public for the malicious bots.