LibreNews does not track you, your device, or your enabled channels in any way. Furthermore, LibreNews takes the following steps to prevent your devices from being tracked by others:
While the LibreNews server records the number of unique IPs it has received notification requests from, this information is displayed clearly on the server homepage and is not logged. Furthermore, the count is reset every 24 hours on the default notification server.
[1] Because LibreNews causes your device to periodically send out 'pings' to the notification server, an attacker could theoretically track your device by following any devices which send out a ping at the same frequency to the same IP, even if you were using a VPN. To address this type of attack, LibreNews includes a bit of 'fuzzing' when pulling new notifications from the server (i.e. a 2 minute refresh time could be 1:50, 2:03, etc), making this attack vector significantly less feasable.