Allow, NOT entirely true.
SSP's join on reduced salaries and no they can't pay up front. DEP's do not take a paycut. SSP's start on approx £45k including allowances whereas DEP's start on £62k approx. SSP's have higher pay-rises each year for the first 4/5 years so that they can catch up with the DEP salary.
So... for DEP's, it IS free, not to mention that SSP's taking a pay cut is different to paying the airline money up front. I don't know of ANY FR pilots earning £45k in their first year AND they pay for their type rating first. Don't try and make it sound like there is ANY comparison between the two. There isn't.