This is an unfortunate side effect of what this developer has set in motion. I don't know enough about either side to make a determination of who is right or wrong, but neither do the people harassing this business on Facebook.

From his Behance page: "Half a year's worth of work, weeks of waiting on end because they couldn't find the fingers at the end of their arms and in the end they try to screw me over by ignoring the invoices. "

That a pretty aggressive play in words. I suspect if he is really looking for "justice" he'd gain a lot more support in exposing the entire situation, not just some pretty screen shots and shouting about unpaid invoices.

I for one am genuinely interested in learning more about this, both sides preferably.