Considering that Slack itself complained to the competition authorities that there is fierce competition from Microsoft and others, eating Slack's lunch, it see

Considering that Slack itself complained to the competition authorities that there is fierce competition from Microsoft and others, eating Slack's lunch, it seems hard. Salesforce can easily claim that the acquisition doesn't reduce competition, because Slack has a very small market share, or even that Slack would soon be bankrupt and needs to be saved. https://www.cnbc.com/2020/07/22/slack-accuses-microsoft-of-anticompetitive-practices-in-eu-complaint.html https://www.cnbc.com/2020/07/22/slack-accuses-microsoft-of-a...