Even luckier, their system handled the load apparently. Hopefully their eng team is proud of it.
Other than the 1:30 hour downtime that happened to a lot of old accounts. I actually think it's genius if they throttled old accounts just to let new people see how good telegram is.
I have an account as old as you can get, and had no problems, so I'd be interested in proof of a disproportionate impact on older accounts.