Intel and AMD both sell quite a lot of customized chips, at least in the server space. As one example, any EC2 R7i or R7a instance you have are not running on a Sapphire Rapids or EPYC processor that you could buy, but instead one customized for AWS. I would presume that other cloud providers have similar deals worked out.
It's not like Intel or AMD are known for letting other customize their existing chip designs.