Intel and AMD settled a suit in 2009 :
https://www.amd.com/en/corporate/antitrust-ruling
" ... Intel must not ... Intentionally include design/engineering elements in its products that artificially impair the performance of any AMD microprocessor."
" ... Intel must not ... Intentionally include design/engineering elements in its products that artificially impair the performance of any AMD microprocessor."
What we are seeing has to be a new deal.