Not at all. From what I understand of this article, it wouldn’t stop you from doing anything you wanted with the image. It just generates a signed certificate at the moment the picture is taken that authenticates that that particular image existed at that particular time. You can copy the image if you like.
Forgive the cynicism, but: free, for now.
What happens when the company decides all of a sudden to lock the service behind a subscription pay wall?
Do you still maintain rights to your photos when you use this service?
I have no idea what you’re proposing be “locked behind a subscription pay wall.” The certificate exists and is public from the moment the picture is taken. It can be validated by anyone from that point forward, otherwise it would be pointless. Post the timestamp and the public key on a public blockchain and there’s nothing that can be “taken away” after that.
Your rights to your photos are from your copyright on them. This service shouldn’t affect that. Read the EULA and don’t sign your rights away and there’s no way they can be taken.
I suppose if they are running some kind of identity-verification service they could cut you off from that and prevent future photos you take from being signed after that, but that doesn’t change the past.