If you already have a watch the feature won't be disabled. If you choose to buy a watch now you're aware that the feature won't be workable. There is no case for a CAL.This will open a consumer class action lawsuit. I want the money back I paid for the feature to work. Rather it’s $5, $10 etc. Principal! One way or another, Apple is going to pay out to Masimo or consumers.
"Apple confirmed that the Blood Oxygen app will remain functional on previously-sold Series 9 and Ultra 2 models. The feature will also remain available on Apple Watch models sold outside the U.S., as the sales ban does not apply internationally."
Otherwise, go to several retailers that have the feature turned on with their current supply of Apple Watches.