Taping-the-Mouth-Shut is my favorite. Did they mention that one?
A subscription is by common definition, a recurring payment. You should always be able to cancel easily, but it make no sense to opt out of the subscription at the time of subscribing.
for later
It is an interesting field.
Even items can be arranged on a restaurant menu in such a way as to steer customers to certain items.
Ever donate to an (R) candidate using WinRed? You’ve probably seen ALL of these techniques multiple times during that annoying exercise!
My favorite one was a site that listed “approved” home-improvement and other service providers.
You could “subscribe” online, but cancellations had to be in writing, and you gave them permission to guess the new expiration date on your card so they could continue to charge you if hadn’t cancelled in writing.
My second favorite was the old America On Line routine. You cancelled but they kept coming up with ways to extend your membership. The only way I got out of it was to let the card expire and then send them a postal money order for what they said I owed. I continued to receive those damn CDs for some time.