if the admin actually did the "exit scam". but I wouldn't be surprise if he/she did I'm just saddened that this instances of scams will
accumulate to the point where people will doubt even great and trusted gambling site.
The websites which you have mentioned are here for a very long time and you can play there safely. The sites like safedice and other new ones can scam any time. I mostly play on the old trusted sites and when I play on the new sites I usually withdraw my amount on the same day and do not keep my bitcoins on these new sites. So in case a site is down, I have nothing to lose.