I don't have a very sharp view of the practices in the US. In The Netherlands it is possible that the employer and the applicant agree to a proof period of maximally 2 months in which both sides are able to terminate the contract.
It is also possible here to offer the applicant a temporary contract which can be renewed two times (for the same contract period). Both parties needs to keep to this contract, they can only end it on pre-negotiated terms.
After two renewals of the contract the employer needs to let you go or your contract changes in a normal, non-temporary one.
I think these measures are more appropriate to deal with uncertainties about possible misfits? It makes sure both parties make a commitment for trying to make it fit as I see it.
I read something completely opposite here:
«Candidates get about three weeks of work to complete in a week — and not much guidance. “It’s ‘Here’s your desk and some people you should know,’ ” Mr. Rusenko said.»
I wonder if they could not improve their interviewing skills.