OK, then I will spell out for you how I see the rest of that description can be interpreted:
Polyamory, often abbreviated to poly, is sometimes described as consensual, ethical, or responsible non-monogamy.
(emphasis mine) I have no personal issue with that, although differing people have different interpretations of what is "ethical" and "responsible". And note that this is "sometimes" which implies not always, which implies that there are some for whom it does not apply, but who still can be considered to be poly. I think that phrasing is quite deliberate.
The word is occasionally used more broadly to refer to any sexual or romantic relationships that are not sexually exclusive, though there is disagreement on how broadly it applies;
This phrase very clearly says that there is no overall concensus for this to be part of the definition, implying that there are those for whom it does not apply.
an emphasis on ethics, honesty, and transparency all around is widely regarded as the crucial defining characteristic.
Again, not universally, implying that there are some who do not who can legitimately call themselves poly.
So I can find myself in agreement with the Wikipedia definition, and the part that I have broken apart here. I think that most of the members on here also agree with that. I see no reason to make efforts to change it, either.
But none of this, and I mean
none of this implies that these traits are a requirement for being poly, in fact they are worded to very clearly indicate that this is not part of the universally-accepted definition.
So, the "rules" for poly, in terms of absolutes of who is and who isn't poly, come down to that first part that I quoted previously.
The issue for me is, do we want to regard these as crucial defining characteristics?
If
you want to, then please add those in to your definition of what
your poly is. That's the beauty of this, from my perspective. Me, I don't add them in as crucial, defining characteristics of the global definition of polyamory, no.
The foundations
for me for GOOD, working, healthy poly, are the same thing as the foundations for good, working healthy relationships: trust, honesty, transparency, openness, commitment, and the other great things that have been mentioned already - just with more people involved. It's as simple and as complicated as that.