>doesn't the legal responsibility here lie with whichever person added Otter AI to group-calls without informing the other members

IANAL but companies providing a product has certain responsibilities too, especially when they're intended to be used for a given purpose (ie. recording meetings with other people on it). Most call recording software I come across have a recording notice that can't be disabled, presumably to avoid lawsuits like this.

>EDIT: So the crux of the matter is whether-or-not having Otter AI automatically join meetings via their Slack/Zoom/etc integrations is by-itself legally wrong - or not:

Note the preceding paragraph also notes that even when the integrations aren't used, otter only obtains consent from the meeting host. In all-party consent states that's clearly not sufficient.

>because the fact it's "AI" isn't really relevant here

Again, IANAL, but "recording" laws might not apply if they're merely transcribing the audio? To take an extreme case, it's (probably) legal to hire a stenographer to sit next to you on meetings and transcribe everything on the call, even if you don't tell any other participants. Otter is a note-taking app, so they might have been in the clear if they weren't recording for AI training.

I had a conversation with a lawyer who had invited OtterAI to our confidential meeting. I was gobsmacked, and I quickly read Otter's privacy statement -- my impression was that they retain your data in a cloud service and use your "anonymized" (or was it "depersonalized"?) recordings as future training data. Even if they have a bona fide reason for all that, I question their ability to store the data securely and succeed in anonymizing data that contains unique identifiers that could be tied to future court records. I refused to continue in the presence of the bot.

And, even beyond security is their ability to hold promises made over the data in the event of a private equity takeover, a rogue employee, etc.