Sigh.

One. More. Time.

At the time the planes were sold, the AOA features were not deemed added safety measures. They were customization features for the cockpit and for flight crew functionality. They were not add-ons intended to make the plane less likely to crash, available to any airlines who cared about such things (as you imply).

Hindsight has has changed that, now that the issues with AOA malfunction and it’s impact on MCAS are known. When airlines bought, those issues - or even the potential for such issues - did not exist. It’s easy to be a critic with the benefit of hindsight.

Wherever you came up with this theory that AC splurged on making the planes more safe while other airlines intentionally chose planes that were more likely to crash (in order to save money) is beyond me.