They claim that they store user data on different servers in different jurisdictions so it becomes more difficult for authorities to gain access [1]. Maybe that's true and it has something to do with these DCs that seem to be unused.
They do not claim that. They do claim that they store specifically encryption keys in several data centers in different jurisdictions. Here is the exact quote: "All data is stored heavily encrypted and the encryption keys in each case are stored in several other data centers in different jurisdictions". So only keys are distributed.
What does heavily encrypted even mean? Fully encrypted? Slightly encrypted? Encrypted enough to call it “heavily encrypted” but not enough to be protected from whoever is interested?
Heavily means the key is large so it takes longer to crack, but also longer to encrypt/decrypt, so the service is more costly to run and slower. At least I've seen it used that way
loading story #48923749
loading story #48926842
It's more about the fact that five eyes intelligence services prefer to officially spy on each other's countries so they don't have to answer to their respective bureaucrats. They prefer plausible deniability.
Something like this:
DC1 politically belongs to UK which "spies" on CA/US but physical servers are located in US so US ultimately retains control.
DC2 politically belongs to France which "spies" on RUS/UKR/DE but physical servers are located in NL (e.g. in UK because one wouldn't be able to spot difference in ping). Maybe it's politically owned by UK/NZ or UK/AUS because France can't be publicly caught spying on Germany. But France wouldn't risk public arrest of Telegram CEO and the spectacle with russia if there is nothing to gain.
DC4 politically belongs to USA which "spies" on UK/Israel but physical servers are in NL/UK
DC5 politically belongs to UK/USA which "spies" on AUS/China/India but physical servers are in Singapore (e.g. former UK colony)
Really cool to see realpolitik mapped out like this. It also highlights the problem of metadata with these kind of topics.
The reason it's in Singapore is that Telegram can't operate in China, and Singapore-washing is the closest thing to doing it. A ton of VPNs and other services targeting mainland users but not allowed in the mainland are hosted there, it's a huge hub for companies and networks.