[lewisl9029]

Yes they're definitely trading one bias for another in this case. Users who value privacy simply won't use Windows 10 to begin with. And you can't collect telemetry data from non-users.

Users who turn off telemetry can still give you one crucial data point: the percentage of users who do care enough about privacy to turn off telemetry. But this data point is something they simply can't capture because of their insistence on making telemetry mandatory. And any future decisions they make with regards to privacy and telemetry usage will now have to be based on speculation instead of hard data.

In addition to biasing their telemetry data to the subset of users who don't care strongly about privacy, this decision also has a real cost in terms of adoption rates, market share, and damage to the goodwill they've slowly built up over the years in other areas. I just can't see why they'd think this is a worthwhile tradeoff.