There should be a law that you can cancel via the same method that you signed up.

For example you can sign up for recurring paid channels on the Amazon app on Roku, but have to log in on the computer to cancel.

What happens is my 80-year old parents try a week of HBO, Starz, Showtime, Britbox etc. Then can't figure out where they actually signed up. Was it under roku, under amazon, under a new app? What credentials did they use? Then they forget about it and are billed in perpetuity.