[kevingadd]

Well, I'll tell you right now that you can expect to be forgotten or actively ignored by 80-90% of the companies you interview with. That is sadly normal, in part because recruiting/HR departments have incredibly high turnover, and even the mediocre companies get lots of applicants.

However, you're absolutely right that having someone come on-site for interviews and a coding test and then ignoring them is unacceptable. I assume you've tried all the obvious steps for correcting it, like following up with the recruiter multiple times and reaching out to contacts at the company. Sometimes companies take their sweet time processing interview feedback, but a recruiter should definitely tell you that - and taking more than a couple weeks is probably always wrong. In cases where recruiters and low level people dropped the ball on recruiting, I have sometimes had good results from reaching out to people who cared - regardless of the results of the interview, most people don't want their company to get a reputation for mistreating candidates.

On the other hand, I don't know if I recommend burning your bridges.