I for one live in a plastic bag to mitigate any risk that I might leave DNA around to be exploited.

Really, it's not a risk. You won't be able to name a single case of active harm caused by disclosure or sharing of genetic information. The worst thing that is possible is to learn your family isn't what you expected it to be. There have been no other known cases of harm due to genetic disclosure.

This will absolutely change if someone decided that DNA makes for a good way to access your bank account. It is not. It would be no better to key your bank account to an image of your face. Face unlocking phones look to be a good testbed for what might go wrong if security is placed on this kind of footing.