I've seen another instance of a comment discussing recipes in the mega getting removed because it doesn't go "CW: meat". This has not been an established rule of the site and shouldn't be a requirement.
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The rule to nsfw and use content warnings for images of flesh was instated in the midst/wake of the vegan struggle session. It was presented as a fair measure, specifically for the food comm, to give people who might view such images as effectively gore the option to not see it. This has spread to requiring the blurring of ice cream site-wide and now apparently includes mentioning fried chicken. This is absolutely not in line with the purpose of the original policy and does not, in fact, promote the general welfare of the site.
My recollection is that the general range of what content needs to be CW'd has been basically the same since the start, while meat absolutely was the stuff that got the most focus, as far as I remember dairy was included pretty much right away, and there was plenty of discussion about the dairy industry alongside meat industry during those times.
That doesnt really affect wether or not you disagree with the overall policy, but I dont think it has been a slippery slope at all really, and I disagree with presenting it like that.