It appears to be hosted on a shared hosting server (one that is likely going to limit bandwidth after x amount of bandwidth and quite possibly also limit the amount of CPU resources the site is allowed ot take up).
I anticipate the site being down again in the future and having to be moved. It's running on Joomla or one of its variants - which is a piece of crap application if you are trying to server large volumes of content. It just isn't robust.
And more importantly, the novelty of this will wear off - but perhaps not before even the 'threat' of lawsuits causes them to buckle. I can see where problems can easily arise, especially in cases where they end up having information about undercover individuals - I mean they will have to rely upon the agencies to update them on a regular basis with their personnel roster - and a person who currently is not undercover may become and undercover officer, and suddenly the agency would have to notify the website of those changes.
The agency does not have any obligation to update the website people - and knowing that, I can't believe that they really have that many agencies who have given them information. If they have because of FOI requirements, then it's going to be a burden on the site operators to make sure that information stays up to date - because if they have data on there that is not accurate, they'll be a lawsuit in no time.
Lastly - most of the time nothing good can be gained by publically attempting to discredit an officer on a site like that. The posters are 'anonymous' - If they are truly anonymous (are not required to provide any identifiable information before posting and are using public hotspots where it would be impossible to track the poster down), then that'll get the site into a heap of trouble of people are slandering an officer and proof cannot be provided.
It's a waste of their time - I predict it will last a short time now that it is getting media coverage. Most hosts are n ot going to want to deal with the complaints. And those who are willing to deal with the complaints, excessive resource usage, etc. are going to charge an arm and a leg for it.
Mike