Slack was built for team communication. The Blockchain community resorted to using it for community building but faced some of these problems:

Lack of trust System

The platform lacks rating or reputation control. Many ICOs have become victims of sniffing. Spamming and disinformation is one of the biggest problems here.

Lack of Laws

Every community should have the capacity to set its laws which can be validated via consensus by the community members.

Navigation Issues

Any user in more than 10 slack groups has a hard times switching and remembering passwords to each one of them.

Discovery

People need to discovery new communities and apply to join. Slack lacks this.

Expenses

The free plan is as sweet as it can be but with up to 10,000 messages, the hosts are charged minimum of $6.67 per user per month — it’s $80,0000 for 1000 community members in a year!