Not all telemetry is alike:
1. Let's collect information on every URL, including every distinct pornhub URL, a user visits.
2. Let's collect information on how many times a user browses pornhub.
3. Let's collect information about how and when a pornhub site crashes our browser.
4. Let's collect information about how and when our browser crashes - without submitting the website that crashed it, just the internal info such as call stacks.
Only 3 and 4 are are about fixing bugs, and while 3 would maybe make it easier to reproduce issues by knowing the exact website that triggers faulty behavior, you end up with a lot of information about your individual users that could be abused.
1 and 2 are about potentially making your product better by being able to tell what websites (or features, etc) users are actually using and focusing on improving those features, or figuring out why they do not use the other great features (e.g. bad UX?). However, this comes at the great expense for user privacy.
What really makes me mad about microsoft is how little they are telling you what kind of telemetry they actually collect at what configurable level. I do not know if they do 1 or 2 or 3 or 4 or any combination thereof by reading their privacy notice. The privacy notice says (or used to say?) that they can even transmit your files around for telemetry/bug fixing purposes if they feel like it. And they are very unclear about how the data is processed and retained and how long such a data retention is.
I'd be happy to contribute some telemetry depending on what it is. But they are refusing me configure let alone tell what they collect, why they collect data and if they got proper processes in place before they add certain types of data collection, so in this scenario I'd like to opt out completely. But I cannot because not an option. And I genuinely hope they get slapped with enormous GDPR fines for it.
As a counterpoint, Firefox - while not perfect
- There is an opt-out/opt-in for telemetry/crash reporting
- They have a privacy document describing what they collect and when: https://www.mozilla.org/en-US/privacy/firefox/
- They also openly describe their process, which makes me more confident in them talking this seriously:
https://wiki.mozilla.org/Firefox/Data_Collection
- They show me what telemetry exactly they collect: about:telemetry
(While it's certainly hard to figure what all that data means, it being there in the first place means that third party experts can easily access it and evaluate it)