[xxkylexx]

It's not mandatory, it's a default. I asked the help docs team to update the FAQ to include that there is an opt-out option under account settings.

[self_awareness]

Where's the option? I don't see it.

[TheFreim]

The documentation now says "Users who opt-out from their account settings, to which an option will be added, are excluded" so it appears that there isn't an option yet but that they will add it later.