Syncing and data
What does nouz deliberately not read?
Customer names, addresses, email addresses and phone numbers. Orders are stored against Shopify's own customer identifier, which is enough to tell a new customer from a returning one without holding any personal detail about either.
It is a smaller surface to protect and a smaller obligation to carry, and nothing in a profit statement needs to know who bought the shirt. The same principle applies to your ad accounts, where we read spend and nothing about audiences.
Did this answer it? If not, a person who knows the product will.