Happened to us a few months ago. We got a pair of baby bath kits we didn't ask for. We looked afterward, and saw the ads mixed into our list with no way to remove them. Incredibly slimy practice.
Anyways, we were surprised to see packages of Huggies showing up on our doorstep. Not only did we never add Huggies to the registry, we never added any diapers period. When we checked the registry again, we saw some Huggies ads spliced in discretely and almost imperceptibly. It speaks to our modern day lives that we simply said "wow, they put an ad in our registry... guess that's what Amazon does now" and just kicked off the return process. We've probably wound up with >$100 in Amazon credits based on returned Huggies at this point.
The net is full of terrible reviews but the whole company marketing scheme was based on pure fear mongering. They tried to argue that other diapers are dangerous for your baby. Then when that unsubstantiated fake news got popular, Honest deleted off the website related to it and redirected everyone to their home page. Slimy.
Great reading you can start here: https://slate.com/human-interest/2013/06/honest-diapers-are-...
But the bigger thing that pissed me off was that they give you a $100 credit for diapers and wipes, but the only selection you could use it on was bottom of the barrel ones, and the wipes shipped to us were weeks/days out from expiration (we checked, same item bought at target expires 1+ year out).
Didn't buy diapers from them, cuz my sister got sketchy counterfeit pampers and boxes full of random shit. (I don't know what they saw wrong with the diapers, but all the big brands have serial numbers (for getting points or whatever), and their amazon diapers didn't show up in pampers system...
I ended up pretty happy with Babylist, which is basically a nice centralized tool for clipping item URLs and sharing them. Their business mode seems to be an in-app store, but it doesn’t seem to privilege their store too much over third parties, and there don’t appear to be any ads in the actual registry shared with folks.
It’s as close to the no-frills solution that I originally wanted as I could find. I’ve been pretty happy with it.