I didn't want to quote all the stuff that's been said recently, I
just wanted to add a point.

   The whole question of "a right to a dark sky" revolves around the
definition of a right.  Moral rights and natural rights are all well and
good, but as far as I can see, a right is whatever you or someone
representing you can enforce.  In most civilizations, the government or
the church (or both) defines what the rights of the citizens are, and
then enforces those rights for them.  Here in the U.S., the constitution
provides a "Bill of Rights" from which most if not all legal rights are
considered to derive.  I'm sure that most other countries have
comparable documents.  If you can persuade a court that you have a right
to a dark sky derived in some manner from the Bill of Rights (in the
U.S.), you can prevent (maybe) these billboards from being launched.  To
keep anyone in the world from launching then gets into international law
and the International Court of Justice (correct name?) in the Hague,
something I know little about.