They can do what legacy retailers have done for ages, which is to not stock goods from fly-by-night sellers. Offer customers choice among established brands, and eschew becoming the Western version of DealExtreme, AliExpress or Wish.

I don't see fake reviews of TVs or headphones on Best Buy's site, and I've begun purchasing from brick and mortar establishments (buying online or doing instore pickup) more often now. Amazon's supply chain can't be trusted.