Router-wise, I can throw in a recommendation for the Turris devices by CZ.NIC. (MOX, Omnia, Omni-NG)
They're using their own Turris OS, which is built on a clean OpenWrt base, they don't upload telemetry or display ads of any kind - but they do have a multi-step opt-in if you wish to run honeypots and/or push data to the Sentinel distributed firewall research project.
