Blog posts discussing eBay’s “bhp” URL subdirectory, which originally contained non-structured data “SEO pages” that resulted in a 2014 Google penalty.

eBay SEO History
Hope for eBay’s Future and the End of the BHP Subdirectory
Although it took eBay six full years to take down its “SEO pages,” doing so has finally made way for the long-awaited potential of improved organic Google search rankings for eBay product listing pages. […]