Actually, "make friend" should be replaced by "follow" or it should like friend on discord...etc.

"Fiend of" and "Friends" doesn't really make sense in whole, hopefully they fix this soon by keeping friends only or make "Friends of" to "Followed by"

It's for privacy reasons. Though I am interested in knowing too

The hidden nature of the friend list is neither a bug nor a missing feature. Rather, it is a masterfully crafted statement on our society.

To what extent can you tell if the one you trust truly wishes for your best interests? Such a question has plagued humanity since its inception. Over it, wars have been fought, relationships broken, kingdoms divided, and lives destroyed. In the modern world, we seem to be teaching our children an unfortunate answer: you can’t. Your doctor isn’t trying to save you from cardiovascular problems, brain damage, or death, they are part of a massive conspiracy to get you to buy more toilet paper. The nice kid on Youtube isn’t actually gifting you 5000 free Robux, he is a 30-year-old man trying to expand his international botnet. As such, public distrust is at an all-time high, cultural identity is weakening, and the younger generation is increasingly valuing individualism over conforming to social traditions. Codeforces is merely a product of its environment; only you know which accounts are your friends, while the rest of the site is left none the wiser.

I understand if you think of such a revelation as silly, preposterous, and utterly absurd. I too was once a simple specialist, my worldview incompatible with MikeMirzayanov’s bold creation. Worry not about such nuanced matters and focus your attention on the div 3 contests, and one day it will naturally all make sense.

There's your answer