> In most highly developed countries, there is a probation period for 90+ days for new hires. During this period, you can be fired for any reason.
In an American context, this is generally true in 49 out of 50 states, except that the probation period covers the entire duration of your employment. The people who say firing is expensive are thinking about something else.
Every big tech company in the US has their version of PIP, to protect them from potential law suits as I understand, that lead to a situation that low performers might occupy their positions for months and years.