The Daily Mail is definitely tabloid, although some might describe it as a comic. There are reasons why Wikipedia doesn't allow it as a source.

They are a trash paper so skepticism is warranted but care should be taken not to dismiss facts just because of who reports them. Thankfully, we don't have to depend on the word of the Daily Mail for evidence that the UK doesn't value the ideal of free speech and are far too comfortable punishing and silencing online speech. It's a problem, and it makes their efforts to tie people's online activity to an individual worrying.

The Daily Mail is frequently referred to as either 'The Daily Fail' or 'The Daily Heil' (referring to the fact they supported Oswald Mosley and his fascist ideals, and remain very right wing). It is not a quality publication by any means.

It is by no means a good publication, but at the same time being accepted as a citation on Wikipedia or not is not necessarily a particularly objective measure of quality. I recommend reading https://www.tracingwoodgrains.com/p/reliable-sources-how-wik... for the critical perspective on Wikipedia's integrity in this regard.

It's a chipwrapper.