It's been the case for many years, specially now that modern games are so fucking bad, that AAA companies see fangames as legitimate threats and try to ban them. I've had more fun with Romhacks and Fangames than with any recent AAA release:
>Final Fight LNS
>Castlevania Mugen
>Castlevania the Lecarde Chronicles
>Hyper Metroid
>Metroid Rogue Dawn
>AM2R
>Avengers United Battle Force
>King Of Fighters Definitive Match
And that's just from the top of my head.
Also, Megaman X Corrupted and Metroid X Fusion NEVER EVER