Chia uses a lisp variant, along with the a similar coin model to bitcoins utxo. So it's computationally powerful, while avoiding the security nightmares of Eths account model (i.e. no global variables, functions have no side effects)
This is a cool idea, and you seem genuine. One thing I'm not clear about is how you achieve the claimed privacy. You said the user id data is separated from the user voice data and can't be matched. But you also say that if I delete my account it will delete all the voice data. How do you do this unless there is a mapping from the users table to the voice notes table?