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Qualcomm and Google team up to offer 8 years of Android updates
(arstechnica.com)
This is a most excellent place for technology news and articles.
It is understandable that the answer is "because they can". But another jarring thing is how common locked bootloaders are. You can make pretty much any random laptop privacy-respecting by installing Linux, but there is a good chance your random given phone cannot have things like Lineage?! Or they can but it is so complicated that might as well not count, like Xiaomi...