Nudges can be seen as both positive and/or negative.

It really depends upon ones point of view.

As it was in Hamlet - "Nothing is either good or bad but thinking makes it so."

I've never heard of nudges being "the implicit elimination of certain choices" before.

I usually talk about nudges in Michael Lopp's terms, the Jedi Mind Trick in this post on his Rands in Repose blog:

https://randsinrepose.com/archives/three-superpowers/

The article has that. Google engineers are not going to propose something that will dramatically impact their bottom line. Executives nudge that out of the roadmap.