Additionally, what benefit do we have to gain by preserving these recordings? The whole thing seems massively risky for no reason other than to make a few bucks.
People kept devices which allowed strangers to talk to their children sitting in their house, often in the children's bedroom for nearly a century and it wasn't a major problem. The vast majority of child abuse (like 95+%) is committed by parents or close family members. The danger of strangers is overblown and you shouldn't have to harp on that to get people concerned about companies unnecessarily snarfing up every bit of data about everyone of every age.
Also, It's not just recordings. Once an adversary has account access, they can talk to children. I can't imagine that being a good thing.