The team messaging standard — essential infrastructure, expensive at enterprise scale
3 documented complaints against Slack — paraphrased from BBB filings, Trustpilot reviews, Reddit threads, and public forum posts. Newest complaints first.
Our AI scanner searches Reddit, Trustpilot, BBB, and news sources for fresh complaints from the past year, paraphrases what it finds, and adds anything new to this page. Takes up to 90 seconds.
Sourced from public platforms across US, UK, and global markets — each report links to the original source.
| Platform | Reports | Who's reporting |
|---|---|---|
| 2 | US & global users | |
| TechCrunch | 1 | Various regions |
In 2024, Slack's privacy policy allowed the company to use customer message data for training AI models, with opt-out requiring a specific email request rather than an in-product toggle. Many organizations were unaware they had never opted out. After public backlash, Slack updated the process.
Enterprise IT departments universally compare Slack's per-user cost against Microsoft Teams, which is included in Microsoft 365 subscriptions most enterprises already pay. The cost comparison frequently drives Teams adoption for budget-sensitive organizations.
Organizations on the free tier who exceed 90 days discover that message history before that window is inaccessible. Teams that use Slack as a de facto knowledge base face real information loss when old messages become unreachable.