no thats the myth everyone doesn't know of. a true guru do not ever take something in return for giving you knowledge. they simply enlightens you because you have the hunger for knowledge and they know it. But a teacher is specially trained to teach others who give payments in return. At this time there is no true guru exists on earth anymore because everyone is basically trading their knowledge for money. Where as knowledge should be free and it can be an opportunity to get the knowledge one truly deserve instead of just being a burden on others for spending their money for making us knowledgeable.
I know that there are many teachers who trade their knowledge because they are stuck with their own needs, it is a natural thing to happen, but not all teachers are like that.
indeed the substance of a teacher is to teach good and menyikaan science even though 1 letter even if not paid, it is in my opinion teacher's view. moreover I think a lot of friends who share knowledge without carrying the status of a teacher, not even receive a gift at all, and here many like it.
share knowledge and share about problems, then solve together, learn together. that's what's happening now in my area