Well, they have lost me as a user. The day my IRC client fails to connect to Slack, I will delete my user account. They already had record of all of my interactions using their system. Maybe I won't be able to move any of the groups I am part of away from Slack – But many of us can help create a flood.
Say no to predatory tactics. Say no to _Embrace, Extend and Extinguish_. Say no to Slack.