Daily computing is mostly FOSS programs and my laptop is sold with Linux preinstalled (though I bought the higher spec Windows version and installed Linux myself. Cloud is FOSS, self-hosted in the public cloud (until I get fiber). Phone is rooted Android w/ FOSS apps wherever they meet my needs. I'm about 50% through degoogling and de-Microsofting. Ereader is KOReader (FOSS) running on old Kindle brand hardware. Keyboard is Ergodox Ez which I think the firmware is FOSS. Smarthome is still Smartthings which is not FOSS.
The browser ad on doesn't work in apps, and if they have a blocker outside of that, it probably uses a VPN on the loopback interface to strip out the ads. I run a VPN a fair bit, so I would only be adblocking when I'm not on the VPN. Are there any non-root methods that can do full system ad blocking other than the VPN thing?