Sorry to hear about your experience. You may reset Illustrator Preferences (https://helpx.adobe.com/illustrator/using/setting-preferences.html). This is will again give you the option to Save on your Computer and Cloud Documents. If you save as Save on your Computer and select, don't show. Then from next time, you will get the local save option only, as @Monika Gause said. I hope it helps! Disclaimer: Please note that resetting preferences will remove all the custom settings, and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. Location is mentioned in the article.