Manufacturers aren't required to use speed limiter software, the law allows for cars to only play alert sounds when a driver is breaking speed limits. I rented a 2024 Mercedes in Europe recently that beeped when you were speeding, but otherwise didn't do any active safety measures.
Also, while these speeding alerts are on by default, they can easily be disabled, so most people who understand how to configure their car will probably turn them off.
Plenty of articles online with drivers freaking out that they're being punished for breaking speed limit laws, and explaining how to turn off the alerts.
Compare to ebikes in the EU, where all (legally-imported) ebikes will turn off their motors above 25-30 kmh, and firmware hacking the system to disable it is illegal unless you register it as a moped. Disabling the speed limiter is illegal even if you are riding it on 50 km/h streets where it is legal and safe to go faster.