For feedback, I would just print off the federal labor codes for my country, highlighting specific sections. I'd just hand it to the management verbatim. I wouldn't cherry pick or leave anything out, just emphasize specific passages.
Guess what? That's illegal here.
It would be a thinly veiled threat that I'll ruin their lives if they don't back track immediately... All said without uttering a single syllable.
IMO, there's no reason that vine needed to be shut down. There's so many ways to monetize that kind of platform, and they basically said "we can't figure it out" and closed up shop.