This goes to show that "your" handle on someone else's platform is never really yours. The only thing that can not be taken away from you is a domain name. Start hosting your voice via your own domain.
Domain names can be taken away too, especially ccTLDs. It is harder to seize a domain, but as we have seen time and time again with TPB, Sci-Hub, Wikileaks, etc. you can lose your domain if entities with enough power and influence want it seized.
Good luck trying to argue in a court that your Instagram path is your legal asset and not Instagrams.