Somebody job seeking after a 2 year long recovery from serious illness wouldn't have the connections to their old co-workers or bosses to crowd fund this, and wouldn't have the liquid cash flow to do it themselves.
It unbalances access to jobs by family wealth and creates yet another:tm: skip annoying thing if you are rich enough and/or have enough friends who are rich enough.
The return on investment aspect would just get gamed by companies being excessively selective on which candidates they allow to stay past 2 months.
And finally it extends the worse thing that exists in our society: "It's easier to make money if you have money."
This is what creates and enforces our class system, this is what makes it harder for historically disadvantaged groups to get a head, and such a product would just extend this, while benefiting the company.
The anger is justified, such systems can not be allowed to exist.