Quotes from the news wire:
Russia banned Telegram on its territory in April because we refused to provide decryption keys for all our users' communications to Russia's security agencies. We believe we did the only possible thing, preserving the right of our users to privacy in a troubled country, as a result, we've also been unable to fully comply with the General Data Protection Regulation (GDPR) for our EU-users by the deadline of May 25, 2018. We are continuing our efforts to resolve the situation.
You can not make it safe against criminals and open for governments. It's either secure or not secure, if such a measure is implemented, most of our correspondence, our business secrets, our private data would be put at risk. Because if there's a back door, not only a government official could use it, but theoretically criminals including terrorists [ could too ].
Whenever technological advancement is made it can always be used both for good or for bad, you can compare it with the invention of gunpowder for example : Once the secret is out there, it doesn't make sense to force your local users of gunpowder to make your gunpowder less efficient when the other side can still use it and use it in an efficient way.