We have lots of questions about USB flash drives becoming write-protected and most of them aren't closed. The closest I can find to a canonical question is this, whose answers are rather lacking as they fail to explain why this might happen. Most of the questions are quite old or are written such that they are specific to the user or drive in question so editing one of them to make it canonical might be problematic.
In response to this, I'm preparing a new canonical question intended to consolidate all these questions and answers into a single post. I intend to close most of these questions as duplicates of this new question.
Your thoughts on this?
Okay, I've gone ahead and posted the question and answer. Please post any feedback here.