1 - AdGuard is still installed and set to launch when the computer starts.
2 - Then, this system has been heavily Modified through Third Party Applications. Any time System Modification, to this extent, have been applied to the computer - there will be unintended consequences - like those being experienced .
[Other] com.adguard.mac.adguard.pac.plist (? e795378c - installed 2021-12-23)
[Other] com.adguard.mac.adguard.tun-helper.plist (? 63a82ecb - installed 2021-12-23)
[Loaded] com.adguard.mac.vpn.tun-helper.plist (Adguard Software Limited - installed 2021-12-14)
User Login Items:
[Not Loaded] LaunchAtLogin (Adguard Software Limited - installed 2021-12-14)
Modern Login Item
/Applications/AdGuard VPN.app/Contents/Library/LoginItems/LaunchAtLogin.app
System modifications - There are a large number of system modifications running in the background.
[Not Loaded] com.maintain.Restart.plist (? 5421a7fd - installed 2021-12-23)
[Not Loaded] com.maintain.ShutDown.plist (? 9b7e817c - installed 2021-12-23)