> an easy process to renew and restore cancelled accounts.

What if the person was cancelling and was never given the opportunity to know there was a potential benefit? The ethical thing would also be to completely delete all of their data (including their login). They now come back and you say "sorry we can't restore all of your data, you need to start over". Didn't you just create (1) a bad UX and (2) a new dark pattern?

Again, my point isn't whether the 3-modal pattern is a dark pattern, but rather that dark patterns are incredibly difficult to define, are novel and thus require nuance when determining their ethical ramifications.