Yes, this is a profitable business, but be prepared that at first there may be few customers, since many will not want to shine, they know about the bottom in general. There are many reasons for this. But in general, the idea is very good, and it needs to be deliberately implemented.
It is highly dependent on the location you are placing your ATMs. Then you have to pay the mall or store that owns the land a fee. You would probably make much more just straight up buying bitcoin yourself and waiting for the next all time high.