As far as I know, Telegram is really really open (at the moment) with really few limitations.

For me, this is a very important fact. yes, is a big (and debated) topic; Pavel Durov express many times the point. See: http://techcrunch.com/video/pavel-durov-of-telegram-whatsapp...

BTW, For another story, I pressed Telegram to know if I could or not use bot apss for commercial business.I puplished on my microblog homepage: twitter.com/solyarisoftware the answer I got by https://telegram.me/botsupport (BTW it's an helpdesk/support center, by humans, see typo :-))