Happy to say Solus now has its own vendor pool zones for NTP graciously provided by the NTP Pool Project, allowing us to move away from Google for NTP / time server usage. Our systemd has been updated, stable repo users can expect the update next Friday.
Building on this, we are also looking into alternatives to systemd's default DNS server: Google, such as Cloudflare DNS (which is, by default in systemd, the fallback). Should we find a privacy-oriented alternative that can operate on our scale, we'll look into switching over. Bare in mind, this does not impact any local DNS resolution that occurs in your network, so if you have a home server set up with a DNS server (e.g. dnsmasq) like I do, you won't be affected.