[nicoburns]

It’s opt-out, but it’s not enabled silently. It’s a pre-ticked checkbox on a screen you have to review when you first setup the machine (and when you do a major version OS upgrade).

IMO that’s quite different to something that’s just silently on by default, and requires you to set an environment variable or run a command to opt out.

[ballenf]

On a phone there is no box at all. It's two options to select. The opt-in is highlighted, but there is no "next" button -- you have to select an option.

[IggleSniggle]

I don't think it's pre-checked, is it? I thought it was Yes/No buttons