For reasons that now elude me, I signed up for educative.io last year. It's not great content, little more than a few crappy ebooks in a web UI. I'm pretty sure I turned off auto-renew at the time (because I normally do this for annual subscriptions), but have no written record.
It recently auto-renewed for an annual term (£189), and customer service are refusing to refund. I will, of course, be getting a chargeback from my credit card company.
So if you also foolishly subscribed to an educative.io that is now dormant, make sure you're deleted the account and have written evidence.