On the Off Topic subject that comes up - and steering away from anything personal - just rationally.
In any largish city I imagine that there are at least 100 piano teachers. Any individual in that city will have experience in how those teachers teach with whom he himself has studied - maybe 5 max? He will not have any idea of how the other 95 teach. Now expand this to the world. Nobody can know what all the piano teachers in the world do. Therefore there can be no statement on what all such teachers do. There may be trends - probably even numerous trends - and patterns that teachers fall into. Some of these trends may go in opposing directions. So again, there can be no statement that all teachers do things in a particular manner.
The ones we tend to know about who are not our own teachers (or ourselves if we teach) will be the ones who are famous, who are published etc. There will be teachers who don't follow the status quo such as it exists. If they're not playing the game, they are also less likely to be noticed, so they're invisible. So they are unknown.
Supposing that most music teaching is mediocre or worse, including harmful. If you have experienced some of these, and then come upon an excellent teacher, he is going to stand out head over heels over the rest. You may justifiably want to shout from the rooftops what this teacher is doing, and tear your hair out as you see other students continue to being messed up by their lessons (assuming that they are). But that does not mean that this teacher will be the only excellent teacher out there. You (none no of us) can know all the teachers who exist in the entire world and what they do.
The reality is that teachers work in isolation. The industry also promotes certain things. If you can push kids through the grades super fast, then you'll attract one side of the industry, and you "make it" and get known for that. If you get kids to win competitions or get really high grades in exams, then you get a reputation in that niche. If you have the chops, and can grab students who have been well taught and have natural ability, rejecting the others, and "polish" the career pianists, then this is still another niche for getting known. But what about the teacher who wants to give all students solid skills, who is willing to work as slowly and methodically as is needed, with an aim of giving a particular enjoyment in music which comes from the control you have from acquired solid skills? That teacher fits in none of the niches, and he or she will likely stay invisible and unknown. S/he is not part of the statistics. And worse, parents and students who are new to music may not even realize the treasure they have, since the uninformed tend to be bedazzled by the "fast", the "winning awards/high grades" and other trinkets. When you are well taught from the beginning, everything seems relatively easy, and you don't know that it is in large part from good teaching.
Topic: Money Making Music Teachers