Why is the paint on my bathroom ceiling peeling?

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Sand and repaint the damaged area
2. 2
   Wire the exhaust fan to the light switch
3. 3
   Install a humidity-sensing exhaust fan switch
4. 4
   Replace glass enclosures to allow 6 inches of clearance to the ceiling
5. 5
   Limit hot water availability or shower duration

In their words

Unedited, most upvoted first, each linked to the thread it came from.