Because most of the ones reported to be accelerating uncontrollably are Camries and Avalons (and their rebadged Lexus versions), which aren’t sold in many other countries.
That said, there have been reports of Toyotas and joint venture cars (with Toyota parts) doing the same thing in other countries.
Thanks, makes sense if it’s mostly US-market cars.
Must’ve missed the reports from other countries, though. Perhaps they’re not so widely publicised.