Sudowrite co-founder here. We didn't leave out GPT-3 to deceive and will probably include it in the FAQ we're putting together.
Our reasoning to leave it out initially was more about getting the right audience for our beta test:
- Most people outside the tech world (our intended audience is fiction writers at this point) haven't yet heard of GPT-3, so we didn't want to confuse them.
- There's been a problem where people who want to try out GPT-3 try to get access to it through apps that use it. AI Dungeon deals with this a lot. OpenAI discourages direct user access to the prompt, and we've scaled back some of our features already to prevent unfettered access.
I agree it's a little confusing; I'd want to know what was powering the tool myself. Hopefully as OpenAI opens up access we can be a little more open as well.