As someone who is not neurotypical I actually could really use something like this due to memory issues associated with my diagnosis. Especially professionally.
Your comment made me think about it differently, thanks.
We don't need to jam these adversarially, we need a wireless protocol that enables polite behavior. Imagine if you were walking around broadcasting "I'm recording" and you run across somebody broadcasting "please don't record". The devices could prompt a conversation between humans.
Changing the dynamic to one that's resolved initially (rather than later, when somebody's upset because they didn't know they were being recorded) would be a significant shift I think.
Except this "problem" has already been resolved (in the US) at a legal level; Look up your states stance on one-party vs. two-party consent for recording private conversations.
The majority (39/50) of states only require the consent of a single party to record a conversation. If you want to take issue with other people recording conversations they have with you, that is something you should take up with your state's legislature.
For what actual gain? What percentage of a normal friendly conversation is something you want to actually review and document. Less than 5%?