Is it pocket money or does it include the money the university pays to itself?
Does in count the hour to grade exams and other activities the TA do while they have no chalk in their fingers?
The graduate student union negotiated that undergraduate TA’s also get proportional tuition credit so hourly cost to the department is quite high.
Typical POV of an employer mad at the union for doing their job well by getting them paid.
At the end of the day, it’s the taxpayer who is on the hook for paying underpaid TAs far more than what you would expect the market clearing price to be for a CS job for someone without work experience.