The same or a very similar service is also available for free from Cloudflare. It is supposedly even faster than Google's DNS service (4.4.4.4 and 8.8.8.8). Cloudflare claims: "the Internet's fastest, privacy-first public DNS resolver".
You can either use Cloudflare's app (Android, iPhone, Mac, Windows, and Linux):
Or ignore the app and just set your DNS as usual (Android, iPhone, Mac, Windows, Linux):

The full DNS config options are:
Malware Blocking Only Primary DNS: 1.1.1.2 Secondary DNS: 1.0.0.2
Malware and Adult Content Primary DNS: 1.1.1.3 Secondary DNS: 1.0.0.3
For IPv6 use:
Malware Blocking Only Primary DNS: 2606:4700:4700::1112 Secondary DNS: 2606:4700:4700::1002
Malware and Adult Content Primary DNS: 2606:4700:4700::1113 Secondary DNS: 2606:4700:4700::1003

And yes it works. I would recommend to ignore the app and just set your DNS manually. The app is for people who do not know how to set a DNS address. If you want to read even more read: https://blog.cloudflare.com/announcing-the-results-of-the-1-1-1-1-public-dns-resolver-privacy-examination/