Slack is up!! If you hold some ATOM shoot me PM with your email. I will send you invitation. (recommended)

Can't you make it free for registration?
NOT.
Because , dev wants to sell more ATOM

I don't understand your point ? what's the relation between slack and dev sell more ATOM
Slack is a platform for chatting, just like troll box, No any relation to sell ATOM, Exchange does.
registration is FREE, you just need invitation, and dev clearly said, PM him your email, and you got your invitation.
hehe yes i dont understand it 2...but its crypto...nothing is impossible by the noobs
slack is just for chatting...some channel got autoinvite for slack..maybe its the next thing to do