So one of the first impressions that new people get (myself included) is that WotC released (or allowed the release of) a shoddy video game. That hurts the brand IMO.
Did it stop you from playing the table top RPG? If not, then the brand wasn't harmed in the manner you are supposing it is.
Did it stop you from picking up any other D&D video game to play? Like, did you choose not to buy Beamdog's Baldur's Gate and/or Icewind Dale Enhanced Editions because Sword Coast Legends was bad? If not, then the D&D brand wasn't harmed in the manner you are supposing it is.
What exactly have you stopped doing with the D&D brand because you played a bad video game that had the D&D brand upon it? How has SCL specifically affected your use of things with the D&D brand?