If you manage to persuade a million people to put £200 on an Electron card that pays no interest you have £200 million on which you pay no interest, that would by a few boeings, not that there is any link of course.
Aside from FACT that FR haven't accepted as a free card for well over a year and secondly IF you have an Electron card that is with a BANK where you can spend the money where you like.
But please do tell how an airline gets a benefit from someone in Germany having an electron card with a German bank and who has have never flown Ryanair..........this should be interesting.