If you want TL;DR, go to "Comparison of Stack and Hashnode".
In a general way, Stack individual believes in a logic of total competition, rather than a logic of collaboration. In the logic of competition, the identification of the opponent is fundamental for him. The opponent, by exclusion, is anyone who is different from myself, or at least from the idealized image I have of myself.
In addition, those newcomers and junior programmers have their status legitimated in the Stack inidiviual's mind as the weak and losers of open competition with whom they do not wish to identify. They are a kind of natural "trash" of the Stack system.
Due to the Stack system, there are also those who adhere to the cause by selfish and conjectural defence of their immediate individual interests, which is nevertheless legitimate, though occasionally immoral, depending on the point of view.
For all this, Stack restricts the knowledge only to high-ranked privileged senior professionals because they do not like to have much competition, but they are also too competitive because they believe in the logic of competition, therefore, they tend to be right wing, conservative and do not admit the existence of many newcomers and junior programmers the which they see as a menace in their market.
Comparison of Stack and Hashnode
Hashnode is newbie-friendly.
Stack is competitive, individualist so tends to be closed-minded and right-oriented.
Hashnode is collaborative, collectivist, so tends to open-minded and left-oriented.
Stack is elitist and privilegist. It hates newbies and junior programmers. It is overly xenophobic.
Hashnode is open for all.
Stack moderators are authoritarians and impatient, ban everybody without reasons.
Hashnode moderators are supporters of freedom of speech, although Code of Conduct is required, and they are patient.
Stack developers do not hear feedback, censure, close and ban feedbackers.
Hashnode developers hear feedback, implement, improve and welcome feedback.
Stack has upvote and downvote system. If your question is downvoted many times, you will get banned.
Hashnode does not have this caste system.
Stack is Palpatine.
Hashnode is Yoda/Luke Skywalker.
Stack is Sith.
Hashnode is Jedi.
Stack is Galactic Empire.