If you use a loyalty card at a Kroger owned store, they'll tell you if something is flagged for contamination, it's an automated call system. There is already pretty reasonable tracking on the industry side of the food equation; some things are better than others. It's just not at the point of consumption. I'm kind of okay with this, I'd rather the industry as a whole do more things to prevent contamination period. Making a more friendly notification is nice, it could be a phone call, and email, a notification with some app; it's pretty rare and I want it more rare, not a friendlier notification, that's just me though.
Now I think you could make that stuff better, don't get me wrong, I'm not going to hate on Juicero for that. Their entire play was just VC-Bingo though: they had a device, they had a subscription, they had "lock in" (device is only good with the subscription) they had internet attachment, it's a health and wellness type play, probably some other things I'm not thinking of. Anyone know if they had to subsidize the prices, that'd be the grand slam if they had to do that too. $30 a week for 5 packs of juice, that's $120 a month and you do the work and clean up the mess and you have to get different juice on the weekends. The bags aren't supposed to make that much mess but I think the psychology of it all is huge, a coffee maker doesn't make much mess either and you'll pay a gigantic premium at a coffee shop. How many months before you get a tip-top of the line cold press juicer that'll make juice out of any produce? With no subscription.