Not sure what these bans accomplish, other than make people eventually tune out (no pun) rabbonim.
Anyone who's currently using Spotify (for Jewish music) is happy to switch over to this. Any parent who is sensitive to technology understands that any device - even a 'kosher' one - can cause issues with children.
So not sure who these bans with vague fear-mongering concerns ("who says they're truly safe") are targeting.
-1000
Such a kol korei alerts the vast majority of people, myself included, that there is something wrong with such a device, and we will therefore stay away from it.
I want to do what's right. When I see the advertising, I don't necessarily think about the possible pitfalls. But a well explained kol korei (like the email posted on Hefkervelt, which clearly says that it's a step up from unfiltered internet but a step down from Kosher devices) alerts me to the issues, and I won't get it for my kids.
Yes, there are some who will always question rabbonim and will be skeptical. They won't listen to any kol korei, and they already don't respect rabbonim. We don't have to run our frum society around those people.