This is a great question to ask!
(and simple answer - there is nothing to worry about here)
You may see in your Google Adwords account, that the Google Search console traffic to CANDDi is blocked.
This may look like:
There is absolutely nothing to worry about here. We explicitly block the Google Crawler as there's nothing useful for Google to crawl.
Web site owners use the /robots.txt file to give instructions about their site to web robots.
For example, a web robot will try to visit a website, say http://www.example.com/welcome.html. Before ithe bot does, it will check for http://www.example.com/robots.txt, and will find the following:
This will be why you can see http://s.canddi.io in your Google Adwords account being blocked.
Below is a link to an FAQ from Google on what it means when the Search Console blocks a host:
If you notice other hosts are being blocked, then it would be worth reading this FAQ