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Threads gained 10 million new users in seven hours
(www.engadget.com)
This is a most excellent place for technology news and articles.
Why would you believe ANYTHING that meta says?
Is it something they read or something they've done? Perhaps they had to make their own Threads account.
I wouldn't be surprised if many accounts were auto-enrolled, but it may be based on activity or just a random selection to boost numbers without the massive leap of all accounts being transferred at once.