At least in Germany it's usual to have a trail period of a half year in any job. During this time both, the employer or the employee, can resign form the contract with usually a two weeks notice period. Neither side needs to specify reasons in detail.

As this is a normal contractual regulation there is almost no risk of any legal trouble (usually).

On the other hand side as soon as this trail period ends all the German workplace protection regulations start to apply in case of permanent employment contracts. So after the trail period ended it gets quite difficult for an employer to get rid of an employee.

But all in all that's pretty fair, imho. After a half year you quite surely know whether you like the workplace, or form the other perspective, the employee.

Not in the US it doesn't. The turnover rate if anything is a symptom of the problems in the industry.