It becomes public record, or at least publicly posted.
So you can see who submitted testimony, if they are for our against. What additional comments they put. And who the person is.
What people do with that information, well, yeah
I worked at Boeing for over twenty years and at the Kecks for ten years. if you gave public testimony
on a subject, that did not match the politics of your managers on that subject, you were history. it would not be overt,
so you could not prove it, but it would occur.
Lower raises, less attractive job assignments, re-organizations, et al.
If you have your own business or are are retied then you can say what you want.
Big organizations with very specific Cultures, you have to be careful.