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It has advantages and disadvantages.

there is no advantages in storing thousands of identities nobody knows where

I am practical and I choose my battles wisely (I hope).

If I want to travel to foreign countries under the current state of the planet, I need a passport in order to enter and leave through border crossings. To get a passport, I have to submit to some pretty serious kyc. Do I trust governments to keep that kyc identity info safe and confidential? Up to a point.

I guess I have the option to go by foot to remote unregulated places to enter and leave a particular country, but that is not practical and would seriously restrict my opportunities and range for general travel purposes.

With social media, I have a choice of which ones to use and for which purposes. And how and how often. I am against almost everything Facebook does and stands for. But I have an account which I will use on very infrequent occasions for specific purposes, and then not use it again for months and years.

Matthew 10:16 King James Version (KJV)
16 Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.

It's really a necessary 'evil' to help protect users from those wanting to do evil...

Peace.

what evil?) I just want to use a nickname, and Dan wants to collect all the data about every single user

I hear ya'....The evil of which I speak is those who robbed the naive of millions via bogus apps...Of course, this may have been before your time on the platform...Untraceable 'nicknames' cost thousands of unsuspecting users $millions. Besides that, the IRS wants in on the rewards, so it's not Dan really...it's more like cya...all bases...

Peace.