I'm aware of the CPH Foundation, but I'm wondering if there are more ambitious efforts underway.
E.g., I want to believe that there's a market opportunity here: if there were an alternative to Android/iPhone that would only have "non-addictive apps," I would definitely choose that brand for my kids' phones.
Another less ambitious idea: create a certification/standard, kind of equivalent to "Fair Trade," for "non-addictive," or "ethical towards the user," that would apply to apps that fulfill certain minimum requirements.
Tech solutions to a tech problem just add more cost. We need better guidance from birth- funding early childhood education for all parents would be a huge step towards reducing all sort of adverse and traumatic experiences so that it's easier to know who and why we are- a sense of meaning and purpose, and thereby less liable to get sucked into videogames with their built-in purpose (that hardly transfers into meatspace, speaking from experience) and phone diversions.
Now that I've embraced parenthood my apps on this six year old iOS device have reached a steady state: rarely do I install anything new, and then it's just a tool (Bitwarden, to learn about it before I suggest it to my coworkers), except for a dalliance with Slay the Spire last fall- unistalled twice within a week :)
I'm even conflicted about HN; I learn from you all, but time here is time not listening to books, etc., and often my motivation is for the dopamine hit of seeing what's new.
Thermo-nuclear war is another great idea to reduce phone usage.