My gut feeling tells me that they getting thrown out can happen very quickly. All it need is enough witnesses getting complaints about them and then it will be on the to do list of the developers if they like it or not.
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A possible solution could be to make upvote bots transparent and force their owners into the light with name and face since for example @randowale seems to be one of bernies tools. He really built himself a WMD with that and it would only be fair for the users if they knew who they are feeding when requesting an upvote.