We're still getting what we paid for, even if others are getting most of it for free. So it's not breach of contract or anything like that.
It's like Raid Bypass Timers - I bought a bunch of discounted RBT shortly before they introduced Legendary Raids, planning on using them in the upcoming raids, but then they introduced the Legendary RBT. Technically they were correct that the RBT can be used in all the raids that existed when I bought them, so I had no reason to complain.
You're still getting what you paid for.
It is making me reconsider extending my VIP subscription, as there doesn't seem to be much value in it, compared to Premium.