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Despite it's name it can also block IPs and specific apps from connecting to specific servers. I use it to block all manufacturer and OEM related apps that I cannot uninstall through adb or disable. Very handy for blocking constant Chinese phone telemetry pings, as well as additional network level blocklists for ads (Pi-hole like), completely locally so you can trust it unlike a shady VPN.
I checked out your link; it seems to be a mailing list for a hosts file for telemetry? Why is there no option to just see the file without giving in my email? Not the most private.
I'll check Rethink again because all in all it's a fantastic software, just doesn't work very stable for me.