More accurately, don't put your data in someone else's cloud. It could be a lot worse. A company could sell your data when they shut down the product, and there

More accurately, don't put your data in someone else's cloud. It could be a lot worse. A company could sell your data when they shut down the product, and there's not much you can do about it. What happens in a few years when Slack is no longer a hot new thing, revenue slows, and another company buys them out because they'd really love to mine that awesome dataset.