People don't really live there, these are holiday/recreational homes. My family owns two of those islands with a holiday home.
Typically you use them for the weekend. My mom for example lives in a busy city and has a small garden, she uses the holiday home as a weekend getaway and a place to keep the sailing boat.
The Netherlands are small and this area is very central, about 20 minutes drive from Amsterdam or Utrecht. So most owners use it in the same way.
You're not allowed to live there officially, but some people do.
Are they connected to the sewer system? Or do they discharge their effluence into the lake?
So this is the Dutch equivalent of a cottage?
I saw some photos with ladders from the water. Does people go swimming there, is the water clean?
Curious, how does it smell? Living in an old dredged peat bog sounds like smell could be a challenge.