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And let's admit Telegram is not the reason things like Matrix, Delta, XMPP are not more popular. It's just that it is nearly impossible to make them as popular as Telegram because of what people are today.
Durov just sent a valuable message to 1+ billion of people today and it is not appreciated because he didn't the same with e2ee, decentralization, DEI terminology and without being a billionaire.
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He addressed these complaints years ago, the summary is:
Social networks are as useful as how many people use them. So they need to attract people. Technically it is very difficult to provide features that attract people by using e2ee, decentralization, donations etc.
He thinks he can be an enlightened patron and being able to protect himself from power. He has the money to do this particular attempt.
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