Censoring nudity is perfectly reasonable. There are people on Facebook for whom nudity is not appropriate. There are also those who just don't want to see nudity. Should everyone who wants to avoid nudity abstain entirely from using Meta apps? The purpose of Facebook was to connect people. It's SOCIAL media, not SEXUAL media. Nudity is not a requirement for connecting with people. Last time I checked, Messenger allows nudity to be sent in private messages and in message groups. It doesn't need to be, and should not be, on Facebook proper.
And to answer your question, "they" is referring to the people who were starkly in favor of censorship of right-wing opinions, and shadow banning and banning people who post right-wing content, or just generally anything that doesn't fall in line with any of the left-wing's billions of ephemeral and mutable narrative goal posts. I used "they" so as to avoid sounding snarky or antagonistic toward any group in particular, but you asked, so...