I'm not talking about proposing a false question under the pretense that you're going to take it regardless of the answer.
Your assumption that Instagram can grab anything they want just shows the normalcy of this type of behavior. Maybe we, as the consumers of these products, should step up and say that is not cool? If you do it to that person, what is to stop you from doing it to another in the future, to me?
I think it should also be a signal to any one that creates a brand, a business, on Instagram. Instagram can instantly snatch your livelihood without even contacting you.
I'm proposing people being human and remembering that just because a URL path might be a technical creation, there is still a human being behind that and we should treat people as we want to be treated.