Pavel Durov, CEO of Telegram tells it's a scam on Twitter https://twitter.com/durov/status/953047295309774848
One article in french tells it's indeed a scam https://journalducoin.com/altcoins/ico-telegram-scam/
Another article in english shows doubts about this ICO https://www.financemagnates.com/cryptocurrency/news/scam-alert-theres-something-funny-telegram-ico/
Any more information on this topic? For people investing in the ICOs, TON is the next big thing.