Because HN has an 80 char limit on titles.
Edit: we've since changed the title from "Google wants websites to adopt AMP as the default for building webpages (2018)". See https://news.ycombinator.com/item?id=21705610.
Edit: we've since changed the title from "Google wants websites to adopt AMP as the default for building webpages (2018)". See https://news.ycombinator.com/item?id=21705610.