Slack has a limited number of users that can join... unless you pay for more user space. I think it's free up to 50 people in a group and from there you must pay for more slots. So I'd imagine the user slots got filled quickly and thus they couldn't allow anymore invites. Until people start leaving the Slack group and giving up their spot, then there is no way for them to invite more.
RE: Steem / Steemit Slack Invite
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Steem / Steemit Slack Invite
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