Insidious by design...
Matt Stoller, Director of Research at the American Economic Liberties Project and author of 'Goliath: The Hundred Year War Between Monopoly Power and Democracy' (available on Amazon, of course, but I suggest you buy it from your local bookseller instead) runs a blog called BIG... and his latest entry concerns the purchase of Slack by Salesforce which he sees as a defensive move by two multinationals to stave off the total monopolisation of the market by a third multinational called, you guessed it, Microsoft.