DH had a friend who did it, then DH started doing it, and friends of mine have started doing it. So I send a wats app (in text) to someone and I'm usually quite pressed for time with young DC, I see they're online, then their status says "recording audio" and I wait and I wait and I wait... then finally the recording comes, which I then have to wait to buffer properly because it cuts off halfway through, then I have to make sure my ear is right next to the phone because you stand no chance of hearing what they're saying if you are anywhere vaguely noisy and can't shove your headphones in.
And DH sometimes has whole conversations like this with his friends. Just exchanging recordings. I find it infuriating, it's such a waste of time and is an extra effort for the receiver to listen to it and then respond.