The dietpi.txt configuration file states:
# System-wide proxy settings
# - Do not modify, you must use dietpi-config > "Network Options: Adapters" to apply
CONFIG_PROXY_ADDRESS=MyProxyServer.com
CONFIG_PROXY_PORT=...
From a security standpoint, I do not like that there is a default value for this CONFIG_PROXY_ADDRESS setting, and especially that the default refers to an existing domain name (MyProxyServer.com).
In addition, the ‘Do not modify’-note above the setting made me wonder if that domain is already used by dietpi somehow (I have checked and did not see traffic to this third party domain on my router).
I’d like to suggest changing it to use the example.com domain, e.g.:
CONFIG_PROXY_ADDRESS=proxy.example.com
The example com, example org, example net domain names are reserved as special-use domain names for documentation purposes.