SponsoredMessageInfoDescription1

Unlike other apps, Telegram never uses your private data to target ads. YouSponsored messages on Telegram are seeing this message only because someone chose thisbased solely on the topic of the public one-to-manychannels in which they are shown. This means that no user data is mined or analyzed to display ads, and every user viewing a channel as a space to promote theiron Telegram sees the same sponsored messages. This means that no user data is mined or analyzed to display ads, and every user viewing a channel on Telegram sees the same sponsored message.
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