Top 50 Slack

While is a great effort to curate a list of Slack groups, it’s hard to justify paying for something I can do myself—or that I can find through my own network—not only in Slack but in any other group-based platforms. Plus how many Slack groups do I need to be in? Is not something I’ll be using in a daily or repeated basis like an app.

We have no idea how long Slack will be around and "lifetime" is too ambitious of a keyword for a service over which you don't have full control. (Plus it's too expensive)