Why is it not allowed in reddit and telegram to post some qzestions/topics?
So bitcointalk is the only way?
That's because developers *ban* everyone who ask them relevant questions about the product, team and advisors. They don't want the weak parts of the company to surface that's why they try to ignore or silence anybody who could make their potential investors to *just ask questions*.
So instead of answering the questions (which could be seen as a very logical step), they try to silence the questions. And jeep in mind, they claim to be transparent and they intend to raise $40 000 000. But taking into account that they struggle to raise 1500 ETH more for their pre-sale with the discount (only ~50 were raised in 2 days), I doubt their ability to raise $40 000 000.
But all of this is my opinion only. I'm still banned at all of their public Telegram groups for asking questions. You don't have to believe me check all the facts yourself

I didn't know anything about them blocking users on reddit and telegram. Are you sure that these banned users wasn't spamming?