Telegram community is not good source for your investment on ICO project, everything can be fake by looking their telegram member channel by giving airdrop way. You have check on site rating of ICO project and check how much coin have sold to public. Many ICO use many ways to get investor without give based on how correct information about their ICO site.
to be honest, I once believed in the telegram community of a project for investment that I did. but I did check on the project first. because it turns out the team is indeed very responsive to all member questions. especially for IEO in large exchanges to be carried out. and I finally decided to try my luck investing in these coins. and I was lucky because there was a profit that I got. but I'm sure, I'm just lucky.