Enter: DontUseInstagram.com, created by Paul Kruczynski. The site now is designed to pretty much do what it says on the tin: give you reasons why you shouldn't use Instagram. Whether or not you agree with that messaging, it's clearly not infringing on Facebook/Instagram's trademarks. Someone should probably tell Instagram's lawyers. Because they sent a threat letter. In fact, they sent this threat letter before he'd even launched anything at the site, basically trying to intimidate him out of the site before he'd even done anything with it.
https://www.techdirt.com/articles/20210422/16082046660/not-this-again-facebook-threatens-to-sue-guy-who-registered-dontuseinstagramcom.shtml
http://dlvr.it/RyggS5