> As a matter of fact, the same issue did occur to US-based-airlines, and the pilots did catch it.

There was an optional 'AOA disagree' system that an airline could buy that could help pilots know when the MCAS was going crazy. US airlines, perhaps having more money, may have bought those (helping pilots with situational awareness), but airlines in developing countries (with presumably less money) may not have gotten them.

See perhaps §6.4 about Boeing giving that functionality to everyone:

* https://www.faa.gov/sites/faa.gov/files/2022-08/737_RTS_Summ...