Personally, I avoid signing up for things all the time that have auto billing after trials. I try out a ton of services and the overhead of tracking them all on a calendar is just not worth it. A simple pop up could make everybody happy if it was indeed user friendly: “would you like to begin your subscription automatically after the trial?”

Also, in terms of consent and automated systems generally, explicit opt in is really the only way to go. Humans just can’t deal with the mental overhead of the hundreds of “contracts” their “services” require now