I think you are the one jumping to conclusions here Britsimon. I even posted my email conversation with the embassy where they pretty clearly said I just need her name put on DS230, and not I-134, and I posted the list of required documents which don't mention financial documents
at all.
I know that the DV is self-sponsored. I've even posted something to that same effect some months ago in response to someone's post. With that said, someone providing an AoS is a
financial sponsor - that's what I'm talking about. There's no confusion, in terminology or otherwise.
Yes the CO will consider whether someone will be a public charge or not, but it's not determined the same way in every country. If it was solely based on finances, all Ethiopians would be asked by default, yet they don't do that anymore. However, they used to a few years ago. I have 2 family members who previously migrated through DV visas (in separate years), and they were both required to present an AoS from a US citizen. It was an absolute requirement to pass a DV interview, the way it's noted on the Moscow embassy link - it was not something the CO asked only if he felt like it.
It's no longer the case for some reason, and hasn't been in a few years.
I think it's important to acknowledge that even though the DV is one lottery, each US embassy takes local circumstances into consideration when setting specific rules. So what may happen in London or Kuala Lumpur may not apply to Addis Ababa. That's why I directly emailed the Embassy and stated I-134 explicitly, in order to hear it from the horse's mouth. They clearly replied the sponsor's information (i.e. where I will live) needs to be noted on DS 230 ONLY. They too used the word 'sponsor' in their reply so clearly it was not a terminology mistake on my end.
If the Addis Ababa US Embassy's word on what documents are required for Addis Ababa interviews is not good enough, then I don't know.
This year's applicants should also email the Embassy regarding form I-134, and see what they say. That's the prudent thing to do.
eta: for comparison's sake, here is the US Embassy Addis Ababa's handout for Immigrant Visas (other than DV):
http://travel.state.gov/content/dam/visas/pk 3 supplements/ADD - Addis Ababa
They have explicitly explained what financial support documents they need. They could have done the same for DV, but they haven't.
Bottom line: email the embassy and get their official response. If they give you a similar reply to what I received (i.e. not needed), print and take with you to the interview as proof. In any case, if you can get an AoS, do so. It's always better to be over-prepared. In the highly unusual event they ask for financial proof (and you don't have an AoS), you can ask them to give you time to get an AoS. They'll more than likely let you submit the document after your interview considering they never listed it on their list of requirements.