This is a cost driven nonsense and it is high time it was stopped and properly regulated.
At the risk of repeating myself (several times) the blame lies with the CAA.
A TRTO should be used by airlines for training its own recruits. I don't believe the original intention was to enable airlines to tout for business on the streets.
If this distinction were made by the CAA, airlines would have to set themselves up as a CTC-type organization with all the associated expenses.