The site appears to be recovering, if a bit slowly. Disruptions of adult sites is pretty common due to frequent DDOS type attacks. It could also have been a problem with the back end databases. RM appears to use some CDN type services to help avoid disruptions, but mitigating high bandwidth DDOS attacks is expensive.
As far as credit for downtime is concerned, RM doesn't provide any guarantee of uptime in their TOS. Sections 17, 18, and 19 of the TOS are pretty clear that they do not have any liablity for downtime. If there was a major outage, any credit for downtime would be at their discretion because there's no contractual requirement.