Of particular added value there was mention of Android apps that can be setup to self-host an ad-blocking VPN / hosts filtering without rooting: https://news.ycombinator.com/item?id=13853408
Alas the plugin that does host-based blocking is not available in the play store version, it's/was a paid feature for the version on GH only. (edit: Don't know the current state though. remember from some time ago when I last checked it).
Set up a cheap cloud hosted adblocker in an hour for $2.50 a month
https://news.ycombinator.com/item?id=13852109
Of particular added value there was mention of Android apps that can be setup to self-host an ad-blocking VPN / hosts filtering without rooting: https://news.ycombinator.com/item?id=13853408
https://github.com/M66B/NetGuard
NetGuard is the first free and open source no-root firewall for Android.