Earlier quoted context omitted.
It does, at least in the UK
Are you sure about that? I live in Scotland and I think I'd have noticed not being able to hang up a call because the other side didn't.
It almost never happens by accident - the person keeping the line open is paying for it, after all. (Or, traditionally, was, with bundles and free evening/weekend calls, I've no idea if people actually pay for landline calls any more.)