Originally Posted by Mahboob Khan
Make sure that you are Certified so that your teaching is standard.
As long as you are not occupying someone's spot, or space, you should be fine.
If the kids from the other programs like to join your program tell them to complete/sever their relationship with previous coaches and then they can join you.
As long as you mind your own business in your own allotted court space you should not worry.
Certification (USPTA/PTR) does not give any solid guarantee of a teaching standard. The worst paid instructors I have seen have been certified for decades. Certification means what a persons wants it to mean.