I avoid cloud storage whenever I can, but I also know places I deal put my data on them. The cloud sounded like a bad idea when I first heard of it for just this reason.
I do as well. I never store files on the cloud.
Your missing the point. These breached emails are not just from cloud storage. They are from email accounts. Avoiding cloud storage gives you zero protection from your data being in this breach. The article is just saying the whoever gathered this data recently shared it with cloud storage.
Your comment is like hearing a stolen car was found on a beach and replying, “That is why I never go to beaches.”
I keep telling the computer ‘experts’ at work that “cloud” and “security” are mutually exclusive.