For a very very long time (I don't know what it's like these days) Blue Apron's cancellation has been available online, but not linked anywhere on the site. Contacting support would either have them cancelling the subscription for you, or just sending you the link.

It was an extremely dark pattern intended to combat churn, which was a huge problem. Practically nobody working there liked it, but the orders to do things this way came from execs.