DNS blocking with tools like DNSNet get you halfway there without tampering with the apps. It installs itself like a VPN and filters dns requests to ad domains using lists from the same sources as the adblockers.
I say halfway because some apps have a fallback, built-in, ad when it can't reach the server, other serve the ads from their own servers so no way to block them. Most only leave a blank space.
Maybe the lack of deaths is what raises this anti-vaccine ideology.
Where I come from, whenever 2 old women meet, I noticed they always ask how many children they had. And the response is always a variation of: 6 children, 4 alive, 2 dead.
Child mortality is still present in their minds. This is inconceivable to me but my generation still listens to the stories. The future generations are not gonna listen to these stories, the US is probably already in such a future.