You are perfectly welcome to share other peoples' funny definitions of the term "walled garden", but take a look at Wikipedia for example:
Quote:
Similar to a real walled garden, a user in a walled garden is unable to escape this area unless it is through the designated entry/exit points or the walls are removed.
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Now I will grant you that Wikipedia is not a very good source for authoritative info -- note for example that they too pick on Kindles as the exclusive form of walled garden in the ebook world (and Apple may simply not be on their radar

)... but nevertheless, the definition they give is widely shared,
if not actually heeded.