Flipnote 3D could've been downloaded through club Nintendo though it has no online features. You can only share animations by connecting to another 3DS locally which I'm pretty sure no one did.
Swapnote got completely shut down for the child abuse reasons you mentioned though. It got replaced by Swapdoodle years later which is the same thing, but without the ability to attach photos. Also with a ton of monetization.
Flipnote 3D could've been downloaded through club Nintendo though it has no online features. You can only share animations by connecting to another 3DS locally which I'm pretty sure no one did.
Swapnote got completely shut down for the child abuse reasons you mentioned though. It got replaced by Swapdoodle years later which is the same thing, but without the ability to attach photos. Also with a ton of monetization.