No one is going to take freediving courses from these scuba instructors, there are too many great freedivers and world champs teaching and thats where everyone will go, scubies love collecting certifications and this is another merit badge for them to pin on there shirt:t
In Aus Freediving courses are being sold right next to the regulators etc. in the dive shop.
If you've had fun doing scuba courses in the past with a shop, why wouldn't you trust them when go to sell you a freedive course. You may know the instructor, they've taught you before so they get to trade on the exsisting relationship.
At that stage you know very little about the sport, so no real knowledge of what you should/could expect from a good freedive instructor, or if there are other local divers of significant ability teaching in your area.
Cross over students to match the cross over instructors. Courses seem to be well populated round here.........