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The service can be changed, suspended or discontinued at any time

Stack Exchange may change, suspend or discontinue the Services at any time, including the availability of any feature, database, or Content.

Topic: Suspension and Censorship

Your account can be suspended in some cases

"Stack Exchange reserves the right to refuse registration of, or cancel a profile name in its discretion." In the section on Registration and security so more focused on identify theft than other things such as political censorship.

Topic: Suspension and Censorship

The Privacy Policy has plain English translation

See: https://stackexchange.com/legal/privacy-policy

Topic: Easy to read

The content you upload is under a creative commons license but has limitations

All contribution on Stackoverflow made by an user is under a Creative Commons Share Like-Alike License. Although, there are few limitations to it. Limitations: [...] (a) infringes, violates or otherwise interferes with any copyright or trademark of another party, (b) reveals any trade secret, unless Subscriber owns the trade secret or has the owner’s permission to post it, [comment: very vague, trade secrets are a political theme] (c) infringes any intellectual property right of another or the privacy or publicity rights of another, (d) is libelous, defamatory, abusive, threatening, harassing, hateful, offensive or otherwise violates any law or right of any third party, (e) contains a virus, trojan horse, worm, time bomb or other computer programming routine or engine that is intended to damage, detrimentally interfere with, surreptitiously intercept or expropriate any system, data or information, or (f) remains posted after Subscriber has been notified that such Subscriber Content violates any of sections (a) to (e) of this sentence [...]

Topic: Ownership

Your personal data may be used for other purposes

“we’ll notify you before we use the information for something other than the purpose for which it was originally collected” But it is unclear what the notification will be about and what information will be provided.

Topic: Personal Data

Allow anonymous or pseudonymous participation and disable public share

“ Choice is all about making sure you have the ability to control how we share your personal information with others. We want you to be in control of your own data disclosure. To that end, we allow anonymous and pseudonymous participation, allow you to disable several features from public share settings, and to personalize your data features and share settings at: https://stackoverflow.com/users/prediction-data. We almost never share any of your personal information with non-agent third parties, with one exception, where you basically are asking us to do so”

Topic: User choice

Certain personal data can be shared with third party but only with explicit consent

“In the unlikely event that we should need to collect and transfer your sensitive information, we’ll ask first. It’s hard to imagine that we would ever consider collecting, let alone sharing, sensitive information with a non-agent third party, but if such a day should come, we will first give you the opportunity to explicitly consent (opt-in) to such disclosure or to any use of the information for a purpose other than the one for which it was originally collected or previously authorized. ”

Topic: Personal Data

No notice in case of disclosure of information to law enforcement

Data can be shared in response to lawful requests by public authorities, but there is no commitment to notify you in such cases.

Topic: Law enforcement and due process