They could also be mentally unwell. I've known people like this who the Internet massively empowers with its asymmetric abilities and its anonymity. This person might have unlimited free time to conduct their campaigns.

Ask any court clerk about the unending filings they get from disturbed individuals.

https://en.wikipedia.org/wiki/Jonathan_Lee_Riches#History

https://en.wikipedia.org/wiki/Andy_Martin

Not to mention you know who (rhymes with bloatus)