If I know that I'm buying a "Great Value" branded product, that's fine. If I go on Amazon and spend $30 on an official Apple USB charger and get a fake one instead (still with an Apple logo though), then I've got a problem. The manufacturer of these are doing them at even lower quality/safety than the cheap brands like Anker, since they don't have to worry about damage to their own brand when it burns someone's house down.
Amazon has a huge problem with fake products being sold as name brands. Inventory from different sellers gets comingled, so you can't even avoid it by buying from a particular store.
https://www.computerworld.com/article/3133627/technology-law...
https://www.cnbc.com/2016/07/20/birkenstock-quits-amazon-in-... [autoplay video warning]
Some Walmart brand name items are made specifically for Walmart, in much the same way certain items are made specifically for Massdrop. In effect, they're genuine official counterfeits, not the fly by night kind.