Experienced this recently with Hello Fresh. The 'Cancel Subscription' button was so hard to find that I had to spend 10 minutes Googling it (the placement had changed over time and was always difficult to find, so a lot of the search results were no longer relevant). You had to click a button to reveal the cancellation link, and it was a tiny line of grey text on a beige background.
Then, to make it better, they started calling me every day after I canceled my subscription.
I was going to recommend them to all my friends and family, but instead I did the opposite -- I told everyone to avoid them and only mentioned the negative aspects of their service.