The attorneys general case led by Texas [1] asserts that Google created AMP so that Google could stop "header bidding" (which subjects them to competition):
> To respond to the threat of header bidding, Google created Accelerated Mobile Pages (“AMP”), a framework for developing mobile web pages, and made AMP essentially incompatible with JavaScript and header bidding.
1.https://www.texasattorneygeneral.gov/sites/default/files/ima...