That's... not what the DMCA anti-circumvention clause means. At all. The anti-circumvention clause of the DMCA does not deal with the kind of technological measures they're talking about. It only forbids circumvention of technological measures that SPECIFICALLY protect copyrighted material. Not general access controls, not access throttling or user roles or anything general like that. It doesn't even protect against things like circumventing things and convincing Instagrams servers to send copyrighted data. It's meant to protect things like the CSS encoding/encryption on DVDs. It has been used (in RealNetworks v. Streambox, one of the first if not the first lawsuit involving the DMCA right after its passage) to prevent recording streamed content and a single totally undocumented bit ended up being ruled as an adequate 'protection mechanism' when 'circumvention' boiled down to "we didn't know what that bit did because no one would tell us, so we just ignored it". But that was specifically a transfer encoding of the content itself, it didn't have to do with user account control or anything. Courts are very displeased when companies try to use copyright law or the DMCA to facilitate other business goals - like protecting their ability to collect analytics, etc. It's obviously not copyright infringement to get images from Instagram, that's literally what it exists for you to do! Copyright protects copying. And absolutely nothing else.
