It will obviously depend on what the conviction relates to. You might get away with an unpaid speeding ticket 5 years ago!!
Fraud= persons character contains dishonesty and other characteristics you don’t want on flight deck. And you would be out the door.
Another point to be made...is how the airline finds out.
Drink driver himself brought it to light in an interview saying he felt it should be brought to there attention at this point in time that he had done this...
He divided the interview board; he had shown honesty, balls, and professionalism?