How Chewy stands out in a hypercompetitve e-commerce market by obsessing over customer experience — plus 5 key takeaways for founders and marketers — Usually when a brand goes viral on Twitter, it’s for all the wrong reasons. (See: World v. PepsiCo and Jenner, K., 2017.) But recently, Chewy, the pet food and supplies e-commerce biz, went mega-viral for all the right ones. It didn’t happen because of some marketing stunt or PR blitz…