In a tropical climate mold is a real challenge. We have never heard of mold growing in a camera, but that is what has happened to our camera, and it will cost $450 to repair. We’ll buy a new one instead of repairing it, and we’ll look for one that is a little less expensive in case it happens again.
Homes in Indonesia typically have mold in them. It is very hard to eliminate completely. We have had items stored in a closet (handbags & shoes) that we found covered with mold. So if you come and live in Indonesia, you need to be prepared to deal with mold, especially if you have respiratory problems. Even some of the most expensive homes have mold problems.