One big reason why Pinterest ranks so highly, and why you are seeing different tld's in the results, is because they have a variety of tld's that they use and those tld's all have separate crawl budgets from each other. So Google crawls Pinterest about an order of magnitude more than most other sites. You can read more about this here: https://medium.com/pinterest-engineering/how-switching-our-d...
Source: I run a think tank focused on Google’s web crawling advantage and have been studying stuff like this for a couple years now.
Source: I run a think tank focused on Google’s web crawling advantage and have been studying stuff like this for a couple years now.