I'm looking for a free, reputable ad blocker on the Play Store. Something that does local host/filter list filtering using the VPN feature, like Blokada 4 or 5 (before they started cloud hosting the filtering features as a money/data grab).
Personally, I'm no stranger to F-Droid or Obtanium and even have dipped my toes into ADB.
I need this for family members when they start asking, so I can point them at something decent that won't try to fleece them and get on with my life unburdened by family tech support hell. Something they can install through the Play Store they already have and easily switch on and off if something they "need" isn't working.
So that eliminates just setting their DNS to an ad blocking one in their Wi-Fi settings. Wouldn't follow them off that specific connection, and wouldn't be an easy toggle if something broke.
So that eliminates just setting their DNS to an ad blocking one in their Wi-Fi settings.
You can setup DNS ad blocking in the DNS settings, not the wi-fi settings, so it will follow you everywhere. I believe the setting is called "Private DNS" and it works great for me with the free AdGuard DNS. There is a setting to turn it on and off in there too.
It works on any device that lets you set the DNS. Put it on your home router so everything on your wifi benefits, set it in your phone settings so you can benefit when you're not at home. I'm a huge fan. Way easier than setting up your own and it works really well.
It's not free or available on the play store but I've used Adguard for Android for years and it's fantastic. Fire up a VPN endpoint somewhere like Romania and buy a lifetime license for $12 or something and you're good to go. If you want it to work everywhere system wide you'll need magisk and the "Adguard certificate" module that moves the signing cert into the system store, otherwise you won't be able to block ads in Chrome or any other app that uses HTTPS. Any app that creates a VPN to MitM HTTPS traffic will need a system store cert so that's not just an Adguard problem.
I'm pretty sure you can use Adguard to just do VPN+DNS filtering if you don't want to mess with HTTPS traffic but I've always used HTTPS filtering on my devices.
You get some number of days in unlocked trial mode too, so you won't have to pay immediately if you just want to demo functionality.
I am currently using NetGuard and am quite happy with it.
The first thing I do when I download an app is to kill it's wifi and mobile data access before launching it the first time. Makes some games actually payable.