There is another aspect to take into consideration here. Custom touch panel files and graphics.
For this example lets use a TP using a GUIFX design. How do you handle a different company extracting the TP files and re-using them without paying for the graphic sets? What about companies that spend tremendous amounts of time developing custom graphic sets?

I don't make TP designs available unless a client pays for the development time for a specific graphics set. While I think this is less prevalent now than it was 5 years ago, it can still be an issue.

I think people should be aware of what their contract includes and what source if any they will have at the end of a project, but I don't see the need to set it out as a generalized scare or warning.

Fear Mongering in the AV media world would create an unnecessary panic, but a little enlightenment for consumers may not be a bad thing.