He couldn't find a way to make any money from it.
Not sure where you got that from. It's both false and irrelivant to the motivation.
NLDC costs virtually nothing to run. It's minor expenses are covered by pocket change, and my time and the time of the various site admins. The few google ads more than covered the domain name expenses, which was the only real expense.
I decided long ago that I did not wish to continue maintaining the back end and dealing with user support issues, spam attacks, and people using the site as a general image host rather than NoLimits project presentations as intended. Last night I set a date to close it.
It is what it is. There's no need to assume there is some wierd greed related motivation. Selfish with my time and energy, perphaps, but not monitary greed.
Site content will be archived, but not publically accessible.
The site will not be handed over to a new owner or host due to obvious data privacy concerns.
There's a possibility that it may re-open in the future, but probably not until after a new NL release, should it ever come to pass.