Ring potential students will learn what language or homestay programmes you offer in Canada. Search engines work by using key words and site names. As a site owner you may have choosen a name which reflects the unique characteristics of your site, for example the name of your city or the type of service you offer. Ring usually comes out at or near the top of any search. Try it yourself.
Ring simply concentrates Canadian sites on one ring.
The ring logo is just a switching device and is not advertising. The logo's colour can be changed to match your site's colour scheme. Like all Webrings, it is entirely non-commercial. I teach ESL in Japan and many of my students could not easily find out where to study in Canada. I don't make a cent.