I believe many members in this group use and advocate for Revolut?
This is a pretty good story of how security goes wrong. Certainly the victim could have done more to protect themselves but it sounds like Revolut did next to nothing to protect it's customers.
Most certainly any financial service provider should have some security with new accounts and the number of transactions/payments within a period of time.
They save you money because they reduce expenses... Security is apparently one of those expenses