Salesforce's acquisition of Slack is emblematic of a long-standing trend of defensive acquisitions by Big Tech and speaks to the impact of weak antitrust laws
Slack wanted to stay independent. But in a landscape dominated by tech giants, that proved impossible.
Context & Ripple Effects
The arc here runs from rumor to thesis: after the Wall Street Journal reported acquisition talks in late November, Salesforce confirmed the $27.7B purchase of Slack within a week, and Fast Company now reads that speed as the tell — a defensive move by an incumbent buying its way out of a competitive threat rather than building past it.
What makes the piece more than commentary is what came after it in the coverage: Slack's growth decelerated under Salesforce ownership (revenue growth fell from 11.7% to 6.9% during 2022) while customers stayed unmoved, and by 2025 Salesforce was restricting third-party AI firms like Glean from indexing Slack messages — turning the acquired asset into a controlled data moat.
First-order effects
- Slack loses its independence despite wanting to keep it, and Salesforce gains the workspace-messaging layer it lacked against Microsoft's bundled Teams offering.
- Slack's shareholders exit at a premium price set by strategic scarcity — the buyer pool is giants, so the valuation reflects defensive urgency, not standalone fundamentals.
Second-order effects
- Product-focused enterprise companies inspired by Slack's model face a narrowed path: the template outcome is acquisition by a giant or competition against one with vastly greater sales power, as the related analysis of Microsoft's position argues.
- Owning Slack's message corpus gives Salesforce leverage over adjacent markets — the 2025 restrictions on third-party indexers show the acquisition converting rivals' AI products into dependent or excluded parties.
Third-order effects
- If weak antitrust enforcement keeps permitting incumbent purchases of rising independent platforms, enterprise software consolidates toward a structure where category-defining products end up inside suites owned by a handful of giants.
- Acquired communication platforms become proprietary data assets whose value accrues to the acquirer — a pattern that shifts competition from product quality to control over access and indexing rights.
The trend: Big Tech's defensive acquisitions are absorbing independent enterprise platforms and converting them into walled data assets, with antitrust enforcement too weak to interrupt the cycle.