My main issue with Telegram's ICO plans are this:
1. Unless it's in a stable and reliable way to some degree (ie. I pay Apple for a phone, they give me a phone and services without privacy-degrading bullshit attached), I don't want capitalism in my digital shit, especially anything social. That's a whole load of badness waiting to happen. One of the reasons Mastodon is so great is that nobody is trying to turn a profit.
2. fuck cryptocurrency