Slack and Community

We haven't done this, but I think it's a great idea because many people are already on slack. I can't say that I'm specifically a part of any product's community on Slack. I am a part of many Slack groups that are for marketing, though. As long as you are providing a clear value for your target market, it will grow. Last week, I spoke with the community builder for a huge online community and he said they have to actively weed out people making sales pitches each day to keep the value strong. I think that is the thing I dislike about most communities - they just become a giant pitch if not monitored well.

Not used Slack to build a community but @tiagorbf might have some thoughts

Slack is built for company/organization team communication. But it doesn't stop people from building their own community. There are many people who use Slack to build a community. I think it's not a bad idea too. But I don't use Slack to build community because I have more goals and things to achieve rather than a simple community. These are some reasons I built my own community on https://jorcus.com for digital nomads and remote workers.

Lots of people use Slack. These days I use Discord more. (It doesn't mean Slack is wrong to use). If you want to start a community, consider that much of the foundation of that is having conversations. As long as you are having those you can build community, the platform isn't as important as we like to believe.