Hm, I didn't know about this bot. It's a new one, created in March this year. I created my bot 3 years ago, there was nothing like it then.
Looks similar, with additional functionality.
Sad, actually, my bot got zero traction and so somebody had to write their own bot, which is now more popular... So much for motivation to create new things... Oh, well.
Can you also see the actual reviews of the products, or just the total number per star? If the reviews are also available there's potential room for sentiment analysis to automatically determine the common complaints about those products.
That doesn't work though. Those "disposable" cards are not really removed, at least not in my experience, and will still be charged. The Revolut app even conveniently notifies about the charges (but is not telling that they're from the supposedly discarded cards).
No idea about Revolut, but Citi has had a similar built-in feature since something like 2005. It's called "Virtual Account Numbers." You can set total spend limits as well as expiration dates. Once either one is hit, transactions will simply be declined.
As others have mentioned, that prevents the bills from being paid but it doesn't nullify them. They can send the unpaid bills to collections, which creates more hassle for you and negatively impacts your credit score. I wouldn't recommend relying on virtual accounts and spending limits as an alternative to proper cancellation.
Blocking the payments can still be a good idea—money you have in hand is worth far more than the dubious hope of a refund—but you should also keep clear documentation showing that you cancelled your subscription following the specific steps required by the contract before stopping payments.
Ugh, that "loosing all teeth" dream is very disturbing, quite annoying and even painful! Good thing is that I usually don't get it unless I had quite a few drinks the night before.