Get Banned for using MODs in GTA V

Rockstar is banning people on GTA V for using mods, even in Single Player? What the  is going on here?
Yes, Don’t use MOD’s in Grand Theft Auto V even in Singleplayer if you own a LEGIT copy.

According the source :-

Is it the right time to do this ? it good or bad for the PC MASTER RACE ? Terrible timing rock star.The internet is going to cost you millions of dollars in emails now.
What you guys think about this ? Should get banned on Single-player mods ?