Because tb.rg is typically a randomized subdomain generated by AdGuard's (specifically related to $replace rules or redirect rules), there is no single static article titled "tb.rg adguard.net public.php."
public.php is what is known as a or a "tracking beacon." Here is the paradox: AdGuard blocks trackers, but to block them effectively, they need to know what trackers look like. tb.rg adguard.net public.php