I think that HN may in general be an outlier here. Typically outright political content is not allowed, along with religious which is quite often intertwined with politics. Because of the higher quality of the first pass filter here (users flagging this stuff), you don't see the campaigns here that you do on typical social media.

For example in Reddit you'll see accounts that are primed, that is they reuse other upvoted/mostly on topic older existing user replies on new posts of the same topic to build a natural looking account. Then at some point they'll switch to their intended purpose.