Knowing where your competitors get their traffic from?

I found this Method online, it can be very useful for increasing your own traffic by finding Competitors' analytics Reports .
In Google Analytics there is an option to export as pdf, and many people use this option, and then upload the report to their web hosting. Luckily for us Google also manages to index some of these reports, so using a search query such as
filetypedf intitle:dashboard ?referring sites? ?keywords?
will return roughly 1000 Google Analytics reports for various websites.

Analytics reports don?t do us much good unless they are for websites in a similar niche, so add a keyword to the end of that search to find more targeted reports, but make sure it?s not a too specific niche. Something broad like filetypedf intitle:dashboard ?referring sites? ?keywords? games is suitable.

With these reports you should note their most successful and best referring sites.

Example:filetypedf intitle:dashboard "referring sites" "keywords" games

With these reports you should note their most successful and best referring sites.

the command is : filetypedf intitle:dashboard ?referring sites? ?keywords? + your keyword niche.
i don't know why it shows the small image instead of : colon .

Thanks for this and it comes up with a face cus its a : and a "p" next to each other which makes