I prefer to give people as much freedom as possible to manage their community. It would be interesting to know what will come of this. No censorship of moderators like Twitter
Yes, this is a bot, but the time-based currency works for all Telegram users, regardless of the chat. This is not self-promotion: Telegram bots api is open for everyone.
Yes, it's can be invite-only group. Also, in @timecobot the time is carried over between chats. In other words, time is an attribute of the Telegram user, not the chat user.