I use Mailchimp to send out newsletters. It has a double opt in and I never add anyone to it. You can unsubscribe at any time and there is an unsubscribe link on every mailout.
The shop on this site is powered by Woo Commerce. It will hold your address if it is required to send you out a physical product. It will keep your email address in the back end of this site. I can delete that upon request, I just need your name so I can find you. It means that if you shop with me again you will need to add the info again.
This site has numerous security protection strategies in place in case of a hack.
All my computers are password protected and locked away when not in use. I do not use a phone or tablet to access the site or Mailchimp.
If you are worried about any of this just contact me.