Opinions expressed by Entrepreneur contributors are their own. For years, iMessage group chats have been the default work communication tool for millions of businesses. Fast, familiar, already on everyone’s phone. No setup, no training, no cost. It made sense. But a growing number of businesses are walking away from it, and the reasons go well beyond convenience. Using iMessage for work  feels  harmless. Your team is responsive, messages get read, decisions get made. What most business owners don’t realize is what they’re giving up in exchange for that convenience. When your team uses iMessage for work, your business has zero admin access and zero control.  Every file and message your team shares gets downloaded directly onto personal devices. And every conversation about your clients, your pricing, and your business sits in personal storage accounts, not yours.…