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Mail
The Daily Mail's readership is literally dying. Each year, it reduces by the amount of people that have died. It does not attract any new readers.
(The Mail Online is a separate business - albeit with the same right wing editorial - and barely makes any money itself)
The Sun, unfortunately, will always be cross-subsidised by Murdoch.
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The Daily Mail's readership is literally dying but its 'attitude' lives on through their following generations - a kind of comfort blanket - the 'paper' will always be there like mum and dad and my old bunk bed I had as a kid.
As is the Sun - comfort to be reassured that you are as dense as loads of others.
If you enforced any breaking up of the media groups, most papers would fold - apart from the two biggest: The Sun and Mail.
The rest operate on such thin margins they're already at breaking point.
The Mirror will likely merge within Northern & Shell in the next year or so and the Guardian is increasingly toothless. i and Indy already sold off/closed down.