Just read this from that article you posted Doc. I
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If Salesforce were to pay a premium to Slack’s undisturbed share price of 30% (a fairly typical amount in M&A), it would value the messaging software maker at some $21 billion, including net cash. The snag is that Slack is not expected to generate any meaningful operating profit for years. So judged through the prism of returns on invested capital, payback from a deal would be many years off.