I do not thing so. Telegram channel can have a lot of subscribers, but they can be not active. And of course advitising campaign must be in all posible social media, including reddit, steemit, medium and ather. So if you need promotion in reddit you can buy upvotes on
upvotes.ioI also think that the number of subscribers in telegram does not reflect the real state of affairs of the project. Projects need activity in all social media.