https://www.cnet.com/news/pixel-2-removed-from-google-store/

Google is rumored to be launching a less expensive, mid-range phone that's been nicknamed the Pixel 3a or Pixel 3 Lite. Removing the Pixel 2 from its store could be a sign that the company is making room for a newer device. Google stopped selling the Pixel and Pixel XL on its store around this same time last year.  

The company rolled out the Pixel 2 and 2 XL in October 2017. It marked down the phones around Valentine's Day this year.