I don't think it is actually a complaint about cost and wastage, it's a national policy and not LA, so nothing to do with Council Tax in the first place.
I actually believe it's an inherently worthwhile policy, but the issue is it was introduced with no strictures or stipulations and it's being widely abused by feral school-age youth.
The purpose was really to assist young people in further learning or in their first jobs with the cost of travel. A noble cause considering that young people do not usually earn anything close to what their older colleagues do, but they still have the exact same potential travel costs when it comes to actually getting to work.
What has actually happened though, is it's being used by school children who previously walked a 3 or 4 bus stop distance to and from school to completely overwhelm rush-hour buses when they still could easily walk that distance. Not only are they an antisocial nuisance, but they're even more sedentary now thanks to the sheer laziness of busing back and forth on walking-distance routes. Then of course, outside of school hours this has just become an excuse to tour the City free of charge noising up and abusing other passengers.
If you are lucky, you get a driver who doesn't tolerate it and throws the wee shites off, but understandably the majority do absolutely nothing about it, and heaven help any member of the public who dares to stand up to them. It's not just the kids themselves, but you immediately get rounded upon for being an adult antagonising children. The fact the children are themselves entirely the root of the problem, and the transgressors, seems to be lost on many.