Maybe it was before, but now the entire world knows it well. To change it would be taking an incredibly recognizable name—like Twitter for instance—and then just throwing it away. ChatGPT is forever part of history, and almost everyone recognizes it immediately at this point.

it's still a terrible name

it has four syllables

it's hard to pronounce

the last three letters can easily be confused

it looks ugly etc

Tell that to PostgreSQL

Which is also a terrible name.

It’s even horrible with this change