Governments just run sim farms etc. they dont need to use this kind of approach for political influece. Not to say that some dont but generally they will not be stealing accounts. (most bots involved in campaigns to get trump in his seat were not stolen accounts)
I suppose the only difference to the Big 4 is the price tag.
I guess politicians could claim to be hiring a voter research company and profess to be oblivious to the "voter hacking" schemes (hacking the voters' minds to lean whichever way the politician wants them to lean).
I will agree with a sibling up there that the political part is pure speculation, and I’d guess anyone running a moderately sized botnet is open to use for any nefarious purposes if the price is right.
Like what, parties campaigning?