The TTL nowadays is about 3600 seconds, so I think that at about that rate your DNS server would flush stored entries every hour one by one and ask to 9.9.9.9 an update. That’s basically how every DNS server works (and I guess that even the ones embedded in router’s works like that with caching). Is your setup different? If yes, in which way? Thanks
Nice list, thanks! About file sync, have you tried Syncthing? If yes, why didn’t you stick with it? About the app store, are you relying only on Obtanium? What about those apps that don’t provide the apk?