Facebook’s What’s App, Tencent’s WeChat, or an out of nowhere newcomer could take over Slack’s core business in a matter of months.
Amazon to pay $6,000 per Slack user? Come on.
Frederic Filloux

With respect:

If you think these are Slack competitors, I wonder wether you know what is really going on. Slack does have competition, but it is the likes of Hipchat and Microsoft Teams. Whatsapp? For work? Not really.

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