I wasn't entirely sure what to do with this post since Lemmy.World surprisingly doesn't have any terms of service against brigading. In light of this post, I've gone ahead and created Rule 7 against brigading on-site or off-site, and I made it fairly specific to not unnecessarily constrain activism (e.g. relevant votes/petitions) or cross-community engagement (e.g. crossposting or just innocuously linking to another thread). I'm declining to remove this post because I don't think ex post facto rules are fair short of extreme and obviously dangerous behavior, and I hugely appreciate what it's trying to do – foie gras is barbaric and reprehensible (and absolutely fuck Omni for perpetuating it).
At the same time, I think brigading (which this is an unambiguous case of) 1) is a bad look for a community, 2) puts an unnecessary burden on the moderators to properly verify that something isn't just being fabricated or embellished to get a bunch of vegans to go attack someone, 3) rubs up against harassment when directed at low-profile individuals because we can't predict or control what community members will do, and 4) is often ineffective if not counterproductive activism when directed at extremely niche targets.
In this case, I don't think it's likely any human being reading this except the OP has heard of this studio or yogi before today, and I especially think it's basically impossible that the target of the brigading would respond better to several random people all expressing their outrage over this than just one person thoughtfully conveying that same information to them. That is, if this yogi/studio reads about the foie gras issue from one person and still decides to carry on with it, it seems extremely doubtful several people who just heard about this studio saying the same thing could sway them.