Not to excuse companies that make you jump through hoops to unsubscribe, but is there any reason you can't just call your credit card/bank and cut off transactions to a company that's giving you a hard time? I've heard horror stories about people trying to cancel gym memberships, and wondered why they don't just stop paying, and let the gym figure it out.
That stops the payment from happening. But it does not stop your contractual obligation to pay. So it really depends on the business and how much information they have about you, and if they are dirty enough to send you to collections for it. A gym is likely going to send you to collections. An online SaaS is more likely to just cut you off and cancel the account.
never sign up for a gym that needs your ssn. red flag.