Sandeep, it's interesting that you view it that way, but it was never our intention to deliberately make privacy hard. When creating a new room, you can choose to make it public, private and optionally allow anyone from your GitHub org to join your private room. See http://imgur.com/jIb8EKA

It's definitely true that the product focus on Gitter has always been more on public rooms. That's because the focus of our company has always been on the network of public communities, rather than enterprise features, which we feel are well represented in the market by other great products like Slack, Mattermost, etc.

(Background: I'm CTO/Cofounder at Gitter)