Don't know about fairness of the rolls, but I have a 0.25 withdrawal that's been 'Blocked', and it's pretty much impossible to get in contact with anyone from NitroDice.

Have joined their Telegram which has been converted to an 'Announcements' group, and messaged the owner as their last 'Announcement' requested people do. Have had my messages read, but ignored.

If anyone has an alternative way to contact them I'm all ears, otherwise I'd advise everyone to stay the hell away. No use being fair if they don't let you withdraw.