They had been around since 2004. Lots and lots of content GONE FOREVER.
Often the re uploads on other sites are at an inferior streaming video quality.
Inferior compared to how they looked when downloaded from the original site.
Another alternative could be another producer buys the mc-nudes content
I've seen good ones -- Buzz Aziani was loaned the content of 24 mainstreet.com site for a short time and he displayed it along with all of the aziani.com content. He had it until the owner of 24 mainstreet.com asked him to take it down.
Kelly Madison had Gucci LaMour's site up for a time. Another good one.
However, I seen bad ones too -- like the Brazzers acquisition of Reality Gang, whereby no photo galleries and just the video library were acquired and not all the girls who are being featured there are shown. Then it would be a waste of time and effort.