There's also https://roundtable.now
I've had great experience using it for research, debates and constructive criticism. Usually give it a business idea or some tool i'm thinking of creating and then let 4 or 5 models debate it to a go-to-market strategy
That site/app doesn't have a single piece of information about who's running it, what the privacy policy is (besides some AI slop in the FAQ section) etc. etc. - and you're supposed to put business-critical information into it (according to its demo)?!
Why are you recommending something so sketchy?