There is some truth to the phrase, if you don’t pay for the product, then you are the product. And the keyword here is, some.
To some extent it is true that if you are not paying for the service, you really do not have that much say in what the company decides to do.
However, there is also some expectation that you will be treated as a customer and that you will not feel like you are nothing but a product that provides revenue to a company for free.
So if people want to voice their opinion regarding Instagram, even how little effect that will have, let them. If you are annoyed that someone is unhappy with what they feel is unfair, shut the fuck up!
If you do not care about that some are unhappy with something, the rest of us really do not care about what you have to say about it, so again, shut the fuck up.