Counterpoint: airing petty grievances on the Internet has proven, time and again, to be a remarkably effective way of getting the grievance addressed by an otherwise inaccessible third party.
Evidence: just about every post on Hacker News about Google breaking that eventually attracts a personal followup from a Googler who reads HN.
If you're angry about not getting paid and your client has given you control over part of their public-facing persona, I can definitely see using that control to make it known that you are in a state of disunion with them. I can even see it being done with no harm to your reputation because other future potential clients know they will be able to pay you.
Evidence: just about every post on Hacker News about Google breaking that eventually attracts a personal followup from a Googler who reads HN.
If you're angry about not getting paid and your client has given you control over part of their public-facing persona, I can definitely see using that control to make it known that you are in a state of disunion with them. I can even see it being done with no harm to your reputation because other future potential clients know they will be able to pay you.