My argument is different. There should not be any regulation except where existentially necessary (e.g. you need government to manage an army, because otherwise someone else will conquer the country, this sort of thing).
Sure, most rules sound good in isolation. But in aggregate you end up with huge administration and 50% marginal tax rate and massive regulatory burden to businesses. Not able to cancel a subscription easily after you willingly enter into a relationship with some business is too tiny an issue to merit expanding the government monster.
So in your world, I have to protect my credit card details from all evil people in the world forever (and also somehow prevent them from acquiring companies that I've previously given my details to), because it's okay for a company to keep charging my credit card forever, even if I don't want or use the service.
This is pretty much an argument for legalizing theft.
You know this isn't a legal way to terminate a contractual agreement with a company, right?
No, also not a legal method to terminate a contract.
Government shouldn't enforce contract law, got it. Sounds like utopia.