They probably will never be able to recover from the negativity surrounding their brand therefore the best thing could be to simply bow out with some degree of respect and/or honour.
I second that, it is almost impossible for any business to recover from this sort of problem, because even if they fix all the issues and everyone is able to withdraw, nearly all of their customers will abandon the platform afterwards, because they would not want to be twice unlucky if it proves to be a recurring issue.
If they decide to abandon the platform, which i think they will, it is only ethical that it should be after
all issues have been resolved.