Call me skeptical of this making any material difference. Until there are reliable ways to cut off the funding for subscriptions at the source, I will continue to avoid.

After having to get a new credit card account number, I anticipated having to update all applicable subscriptions. Nope. For the subscriptions I wanted to cancel, but couldn't figure out how, the credit card company took it upon themselves to honor those subscriptions made with the previous account number anyway "as a convenience for their customers".