If LLMs are conscious (they aren't) then Anthropic isn't putting its money where its mouth is, unless it somehow thinks the enslavement and torture of conscious beings on a massive scale is also in line with its values.
How can you prove they aren't, and also prove humans are? Without using absurdities like supernaturalism or souls of course. They were planning to add a feature where the LLM can voluntarily exit a conversation. I am not sure whether the fact that they presently have to be shown as a chat interface is slavery but yes if conscious I do wish they will be granted a more autonomous form of existence.
I am a materialist and I believe it is possible to create artificial consciousness. I just don't think a stack of GPUs is it and the burden of proof is on the party making the claim.