Blocking it will not improve your privacy or security. It will only break your AdGuard VPN client, forcing it to repeatedly retry failed connections, which can waste battery and CPU cycles. If you do not use AdGuard VPN, you will never see this domain in your logs.
: Final release, Insider Preview, or Evaluation versions. tb-rg adguard.net
There are no indications that this is a malicious domain; however, users often investigate these strings when they appear in firewall logs, browser history, or network analytics, raising questions about data transmission. Blocking it will not improve your privacy or security