We just finished a pretty early-stage tool to create learn-cards from PDF files using large language models. It's free to use and only requires a registration for user and cost tracking purposes.
So feel free to try it and please give feedback :)
I think that would have been possible without google's help too. Could someone not just send the content encrypted to the client and after signing in sending the corresponding key to decrypt it? Like by using the relatively new Web Crypto API?
Cheers