As for a possible scam report, very few people will do something like that even if they become victims of a scam, some because they don't even know this forum exists, others because they feel embarrassed that something like that happened to them and would rather keep it to themselves than share with the public.
Now that you have mentioned them, I guess the biggest two obstacles to reporting would first be the awareness of this forum (and the scam accusation board) and secondly embarrassment. Having said that, in any case if just one victim came forward with a cloned website domain it would help to stop at least some others from becoming victims. I sincerely hope there were no victims in the months while the website was active.
It is a very large-scale job and it is difficult to make a model that would work reliably, and it can easily be bypassed. In the end, hosting services do not need to deal with content control (except for illegal things like terrorism, drugs, weapons...) on their servers.
I agree, it would be very difficult for hosting providers to monitor every aspect of activity on their servers therefore they can be unaware of clone/scam websites but the real negligence would be if they refused to take action (or delayed taking action) after scams running on their servers were reported to them.