If telegram ban cryptocurrency, what is the purpose of their ICO? You just over reacting dude. I might say that it is the best entry for telegram to promote their ICO where they will promise to improve their service using their own token and blockchain. If that happens, ethereum will get another stronger competitor next to ripple. That sounds more exciting right? Besides, telegram ICO already have millions of investors on their private sale. If they ban cryptocurrency, telegram is just digging their own grave.
Yes, both these things are contradictory. A lot of people using telegram are investors in crypto. If telegram decides to ban all crypto advertisements, these users will also show their revenge by ignoring the ICO launched by Telegram. Who will support an ICO backed by a company which is itself against the growth of crypto community.
If they are doing this to eliminate competition and affect other coins, it is one of the most unprofessional way to do business.