I think this is very helpful

I feel like a teacher myself when I’m doing this

MR.

I'd like to understand your meaning clearly.

Are you meaning that there should be teachers who are responsible for helping every learner that posts a Question below a course video or article? 

Are you meaning that any teacher who has students using Khan Academy should answer any Question their student posts in their subject (such as a math teacher answering any math Question posted by a student in their algebra class)?

Are you meaning that any teacher who has a Khan Academy account should volunteer their free time to help those posting Questions in a subject the teacher understands?

or ... ?

(Once you clarify what you mean, it might be helpful if you gave reasons why you think things should be that way.)

~ Janice, KA user