We've had this discussion in here (i.e. the one regarding any airline covered in the EU regs still have "right to care" obligations), rather interesting that both are refusing (rather more so on bmi than Ryanair).
Ryanair has backed down and will pay reasonable expenses:
Ryanair agrees to pay volcano disruption expenses - Business Traveller
Ryanair says that it will comply with “unfair” EU261 regulations which require airlines to reimburse expenses of disrupted passengers. However it adds that customers will not be entitled to compensation.
And of course MOL had the following to say:
“Ryanair has long campaigned for these reimbursements under passenger rights legislation to be limited to the ticket price paid in the same way they are for train, coach and ferry operators. We will continue to work through the European Low Fares Airlines Association (ELFAA) and other industry bodies to persuade the European Commission and the European Parliament to alter this regulation to put this reasonable limit on these reimbursement claims”.