For people with memory issues, products like this can be life changing.
On a second note, imagine a world where everyone has perfect memory recall. The concept of "recording" someone is useless, as everyone around a conversation (e.g. sitting at the next table at a cafe) would be a 100% reliable witness to the conversation.
Obviously we would not fault someone for taking steps to train their memory to be better, so why fault them for using electronics to improve the limits of biology?
This describes the plot of a Black Mirror episode: https://www.imdb.com/title/tt2089050 (S1 E3)
I guess if you're very good at remembering things and have no disabilities, the use-cases are only bad. That said, we shouldn't let assholes fuck things up.
Garbage people are a large and lucrative addressable market.
I’d also wonder about the legal situation; lots of places have laws against the covert recording of phone conversations, but I’m less sure about in-person private conversations.