Haha, no, AFS isn’t in the “voluntourism” or poverty voyeurism category - it’s a student exchange program with host families. Exchange students attend a normal high school in their host country. It has been around for 70 years. https://www.afsusa.org/study-abroad/programs/?duration=166,167 The cost of a full year program varies with destination but runs around 15-17K, and there are scholarship opportunities available.
Rotary has a program as well, but I believe you have to apply through your local chapter.