GOG.com tried to launch that 9 years ago (source). The problem is getting the rights to sell the films without DRM. No major production company would want an easily shared file so readily available...
It would cost millions to get the rights for a single film. And you're going to sell it DRM-free for $10? Good luck getting financial backing on that.
Used Pihole for years. Gave AdGaurd Home a try and never looked back.
Every few months you'll have to fiddle with your Pihole config as an upgrade breaks it. Unbound is a whole separate beast. Refreshing the lists seem to take a lot of processing. You need a second instance, just because.
AdGaurd Home just works. DNS over HTTPS and DoH for your upstream all built in. Upstream can be fail over or fastest response. Upgrades work in browser in a matter of seconds. And to date, has never fallen over (on the exact same hardware and OS as my Piholes).
AdGaurd Home's service blocking, and Safe Search enforcement is a useful add on for kids devices too.
You should really run 2 instances anyway, for fail over, so why not run one of each and decide for yourself which you prefer?
It's likely designed to only use it, so you're probably SOOL. Try reinstalling the apk: https://m.apkpure.com/samsung-gallery/com.sec.android.gallery3d