[pier25]

Not sure how much it's used on ebay.com but from this presentation it seems to imply that it's used extensively on the site and other projects at the company.

https://www.youtube.com/watch?v=i6eZA8Y_GgA

(their front end stack is presented at about 4:00)

BTW it's a great introduction to Marko compared to React and Vue.

[modalist]

Yes, that is correct. The presenter in that video is Patrick Steele-Idem, the original creator of Marko. eBay.com is predominately built using Marko and Lasso https://github.com/lasso-js/lasso