Some open source operating systems might exclude Californians altogether due to age checks

Open source operating systems are wrestling with how to comply with age-checking bills.
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California Law Requires All Operating Systems to Have Age Verification

A new California state law requires all operating systems, including Windows, macOS, and Linux, to have an age verification ...

California introduces age verification law for all operating systems, including Linux and SteamOS — user age verified during OS account setup

The law's broad definition of an "operating system provider" pulls in not just Windows, macOS, Android, and iOS, but Linux distributions and Valve's SteamOS.