Most of the Cash allocated for Cash for Clunkers went to people that were going to buy a new car anyway.
RCR Stories did an interesting story on this topic:
Multiple academic researchers studying the results of the regulation found the stimulus to be extremely minimal at best, at a high cost.
https://en.m.wikipedia.org/wiki/Car_Allowance_Rebate_System
In the end, it's yet another example of taxes used to enrich those at the top.
https://www.gnu.org/software/hurd/
First released in 1990.