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3rd party Telegram app?
(lemmy.ml)
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I don't think so. As long as you are not in some shady third party fork, you will be okay.
I have been using telegram forks for some time now, never encountered a ban or anything like that.
I was just piqued that if third party forks might offer extra features, some of which if they overlap with Telegram's Premium offering, could be an issue. But I checked out couple of apps listed in this thread and they feel alright. I had confused a fork with a mod of the official app, the latter of which would certainly be a grey area.