>>>>>>all of them seem to be scams, overcharge or not legitimate…

This is not entirely true. Whilst I agree with you that there are dodgy course providers out there I know for a fact that there are also many quality teacher training courses, perfectly legitimate and reasonably priced. I’ve been involved with TESL/TEFL training for many years now and I can certainly recommend a number of courses both online and onsite worth considering.

I’m not sure if I’m allowed to name names here but if you are after a quality online TESL/TEFL course that is also affordable look up ICAL for a start.