I went to greplin.com and was redirected to a cue splash page with no indication that greplin still existed (a link has since been added). Between this redirect away from of greplin.com and the link title "greplin becomes cue," it seemed clear that greplin was no more. It turns out greplin is not scrapped, they have added a link back to it, so you are right I was premature in expecting them to revoke permissions.

That said, if they had in fact replaced a web service with an iPhone app, that would be a fundamentally different product that I did not sign up for, and I would expect them to yield my permissions and start over, or send an email with "click to transfer permissions to the new product." What if they "pivot" to become an email marketer? Would my permissions ride along there? You are right in this case, however.