Autoupdate is a malicious software feature that frequently remotely modifies software on the user's device without asking, sometimes silently and many times in a forced manner without the possibility to refuse this modification (typically in proprietary software). This is a manifestation of update culture. These remote software modifications are called "updates" to make the user think they are a good thing, but in fact they usually introduce more bugs, bloat, security vulnerabilities, annoyance (forced reboots etc.) and malware (even in "open source", see e.g. the many projects on GitHub that introduced intentional malware targeted at Russian users during the Russia-Ukraine war).
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