You can spin it anyway you like, eCOGRAs listing of reputable portals is IMO, yes its an opinion, is promotionally motivated.
Hell, ecogra even host promotional content for its listed portals !!!
http://www.ecogra.com/promo/oggs/
webzcas, whether or not you are proud to be listed there does not change their primary goal (IMO) of having you list them.