That would be a great reason to stop using it. If they never plan to use that data then they're idiots for designing a system that makes them liable for all tha

That would be a great reason to stop using it. If they never plan to use that data then they're idiots for designing a system that makes them liable for all that user data they accumulate in case it leaks. And if there's one constant on the modern planet that is "everyone will get hacked at some point". So that's another good reason to stop using Telegram. Like right now.