If they could get people to install a mobile UI app that fetches instructions on what to up/down-vote, what to flag/vouch then they could and unlikely anyone would notice.

It is unlikely that enough people would check their up/down vote history, vouch and flag history and even then some would assume they fat-fingered such things.

Such a UI could also save and upload username and password to another site. Some people use the same creds on multiple sites.