While the institutions offering an alternative account may or may not hold a full banking license, they are perfectly safe for use. Many of them are Electronic Money Institutions (EMIs), Payment Institutions (PIs) or Investment Firms. They may not be banks, but they still require authorisation to operate in the EU.
It can take years to satisfy the regulator that the business is fully compliant and safe for consumers to use. Once obtained, the firm then has to continue to report to the regulator on an ongoing basis to prove that the business continues to be compliant with regulation.
This is great for Irish customers because they can take comfort in the fact that every regulated alternative is being subjected to the highest of standards. That’s exactly what you should expect from any company you choose to keep your money with.