I know of one individual who managed to register ~1000 accounts with about 50 free STEEM power pr account. ~50000 STEEM is in this persons control now. This is a problem because it gives too much power to individuals with dubious moral standards. If this kind of abuse is discovered after the fact It's currently not possible to do Justice and take back the STEEM given for free.
Instead of giving new accounts free SP it should be possible to allocate some of your SP to any account temporarily and revoke this SP allocation if malicious behavior is discovered in the future. If the new account turns out to be virtues long range the SP can be handed over permanently. If it turns out one person has created all these accounts using fake identity's all the temp-SP can be revoked and Justice is done. This will probably prevent this kind of abuse from ever happening in the first place.
If you don't have time to curate with all your voting power you can hand over your SP to different people you trust for a periode of time so they can curate on your behalf until you revoke it again.