GrapheneOS This is not accurate either. It's not known what's going to happen with the age verification stuff yet and whether GrapheneOS will be permitted.
US congress.gov - It's just a project, but look at the direction they're going and clearly point to the device and operating system.
SEC. 107. Age verification study and report.
(a) Study.—The Secretary of Commerce, in coordination with the Federal Communications Commission and the Federal Trade Commission, shall conduct a study evaluating the most technologically feasible methods and options for developing systems to verify age at the device or operating system level.
(b) Contents.—Such study shall consider—
(1) the benefits of creating a device or operating system level age verification system;