Disabling OG Xbox servers was the real knife in the heart.
R.I.P Halo 2
Anything afterwards was just extra nails in the coffin:
2015 - non Destiny players can only post on #offtopic
2016 - non Destiny players can't post on B.net
2017 - non Destiny 2 players can't post on B.net
2018 - so long B.old threads (Has below radar changed in BF3?)