Why would they? Its name was officially changed. Things are renamed all the time.
For a recent example, Mount Evans in Colorado was changed to Mount Blue Sky
For a recent example, Mount Evans in Colorado was changed to Mount Blue Sky
https://www.cnbctv18.com/technology/google-reclassifies-us-a...
There's a big difference between those two situations.
The executive branch has decided to call it something different than its internationally accepted name as a political stunt. Google could just ignore this, but instead they chose to obey in advance.
If the US government says it’s the name of something, then it’s any map company’s job to display the valid name of the thing to the users in that country. They still show “Gulf of Mexico” to users in other countries.