My father-in-law passed recently, and so I was helping my mother-in-law clean up the digital leftovers today.
It turns out he had subscribed to a few substacks. They had a shared e-mail address, so I went to unsubscribe him and delete the account.
Substack has decided to handle Australia's age verification requirements by demanding verification before logging back in. Which means that we have no option for deleting his account - and she's going to get Substack emails forever.