I was confused by Amber Smalltalk's pivot. Turns out it is just a newer language deciding to use the same name as an existing one. The domain is almost exactly the same as well.
However, having looked at this case I'm not against it for several reasons.
First, it looks like the project has been abandoned. There hasn't been an issue closed in 2 years, and the latest copyright date is 2019.
That might not be enough to sway me, but then you have to realize the project doesn't even really call itself a language. They are "Amber Smalltalk". This is an implementation of Smalltalk, not a language itself.
Amber is an implementation of the Smalltalk language that runs on top of the JavaScript runtime.
Pharo Smalltalk is considered as the reference implementation.
Finally, and the nail in the coffin, over the past couple years in the mailing list there has been little activity -- nominally a monthly message from a single user advertising the "UK Smalltalk User Group Meeting" which sounds interesting but not really about Amber Smalltalk as a project per se.
No one is using it, no one is working on it, and it wasn't a language in the first place. I would say that it's fine for an actual language project to pick up the name.
Bagsy Coprolite.
Strange. It seems to have gone down shortly after this Amber announcement.
It was up the day I read this announcement.