I agree, but when one just points out to the facts, no MSFN rule against it, no rule that would forbid to name the official investors/owners.
Like you wisely pointed out, we are the customers, and have the right to know who owns them.
"Russia funded Facebook, Twitter investments through Kushner investor."
"Institutions with close links to Kremlin":
https://www.theguardian.com/news/2017/nov/05/russia-funded-facebook-twitter-investments-kushner-investor
"Facebook is taking that rumored $200 million investment from Digital Sky Technologies, a Russian investment group... giving Facebook a $10 billion valuation."
This one is from 2009, so $200 million/ $10 billion was a lot, lot more.
https://techcrunch.com/2009/05/26/facebook-takes-that-200-million-investment-from-the-russians-at-a-10-billion-valuation/