I wonder if they are renting cloud servers. Because bare metal in the data center cannot be that expensive
"It's for muh scalability!"
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When we first deployed this system in 2017, only a few servers were necessary. But as the number of people using Signal increased, the number of servers required to support private contact discovery also rose. At its peak, nearly 600 servers were dedicated to private contact discovery alone, at a total cost of more than $2 million dollars per year.
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