Does the employee have a right to unconditionally (employment law and preexisting agreements notwithstanding) continue depriving the employer of his compensation? That seems, to me, completely unjust. Not only is this unjust to employers, but it is hostile to prospective employees as well: How many companies that you've worked for would hire you if they knew they could never let you go? How many of them would avoid giving raises because they would be expected to continue that scale of compensation until you're dead?

In this case, Amazon has chosen to implement something modeled on a judicial process, and that's where it's relevant to talk about burden of proof and who is depriving whom of what.

Employment is not a right, and a job not the possession of the employee (it's rather the other way around,) and employers in the US can in most cases terminate an employee without demonstrating any cause at all. This isn't a "real" court and jury system, so the rules of that framework don't actually matter here.

The purpose of this is not to find fact and arbitrate fairly, it's to discourage employees from engaging in lawsuits against Amazon.

Article 23.

(1) Everyone has the right to work, to free choice of employment, to just and favourable conditions of work and to protection against unemployment.

(2) Everyone, without any discrimination, has the right to equal pay for equal work.

(3) Everyone who works has the right to just and favourable remuneration ensuring for himself and his family an existence worthy of human dignity, and supplemented, if necessary, by other means of social protection.

(4) Everyone has the right to form and to join trade unions for the protection of his interests.