The number of Slack messages your workplace might be able to access has actually grown as Slack has built out its workplace app. Last year, the company launched a new tool called Slack Connect, which allows different workplaces to share channels on the app. The company announced that the feature was expanded again last month, so anyone could send invitations to direct message to other Slack users — even if they work at another workplace (whether users can actually send and accept these invites depends on whether their workplace has put in restrictions).