Serious questions: are not these types of contract a standard in almost any west-EU/north-EU country?
Basically US is very employey/corporation-centric, while EU puts a lot more importance on employees (that are the majority of people by the way)
In my experience, tech workers in the US generally have fewer job stability problems and have a much easier time finding decent work in the first place.
In the vast majority of Western countries the notion of at will employment is considered an ancient, socially unacceptable practice.