What AMP was used for
AMP was popular with news publishers because, until 2021, Google required it for the Top Stories carousel on mobile, and AMP results carried a lightning-bolt icon.
AMP today
In 2021 Google dropped the AMP requirement for Top Stories and removed the AMP badge, and began judging all pages on page experience signals such as Core Web Vitals instead. AMP gives no ranking advantage. Many sites have since dropped it, because keeping two versions of every page is extra work and a fast regular page does the same job.
Should you use AMP?
For most sites, no. Focus on making your regular pages fast: optimized images, less JavaScript, caching and a CDN. If you remove AMP, redirect the AMP URLs to the regular versions with a 301 and remove the amphtml links from your pages.