From Zenz Solutions Wiki

Does personalDNSfilter mine data? What about privacy?

personalDNSfilter does not mine or collect userdata at all. It creates a local VPN on your Android device and only connects to the internet if it needs to download or update the hosts files.

On Windows and Linux it establishes a connection on port 53 to download and update hosts files and to redirect the traffic. No data is mined.

The software projects by Ingo Zenz have been created to protect your privacy, not to violate it.