>>1509669First lesson: Multis.
Having a second account is as easy as having a second device, or downloading Bluestacks (android emulator for windows) and the DW .apk
Initially this gives you a small boost via referral and double rewards from events. The referrels from 20 accounts might be desirable for a certain non-tradable invitation card but aside from this special case, you generally only need one multi for storage and to help with the next lesson.
Spamming accounts/referrels is probably the best way to get banned, but if you want to try you can doctor the DW app with another app called Privacy Blocker. After fixing and re-installing DW it will allow you to quickly revert the app and log a different account or create a new one.
Emails for new accounts only need to be
[email protected] and are not verified, so it's easy to spam accounts using this method. Again, people do get banned for doing this, but I've run one multi without issues. (buying a few mobage coins may help, these guys are greedy as hell)