In Sweden there are digital mailboxes that are considered just as bound to you as physical mail boxes (normal email is considered too flimsy for official mail etc).
If you have such a mailbox a lot of stores will send the receipt digitally instead of printing it at the POS. Although it only works if they know who you are (i.e you basically have to have a membership with the store).
Kivra and such are privately owned, and it seems foolish to trust them with all your data. One should use Min Myndighetspost as a digital mailbox for government-mails, and encourage places to have alternative options (HemkΓΆp and Willys lets you see your receipts on their own websites for example)