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also the content of the translated message is leaked in plain text too?

That is disclosed

Well, the plain text, not the IP, but that should be implicit with how web services work.

I wouldn't say it's obvious to either laymen or technical users, some apps will proxy a web service for the exact reason of hiding user info.

Telegram includes google services baked in to the app for things like maps.

There is a Telegram-FOSS fork with most Google services removed but the translation feature is not removed (yet?) in the code.

I doubt users of Telegram care much or they wouldn't use Telegram in the first place.

Ooooh, GDPR?

Do you really expect Telegram to get the GDPR hammer when Google and Facebook are still around and do orders of magnitude worse?

Easier target?