"Can't you think of any?"

I know the rhetorical game, but am not going to play it with you.

The propaganda phrase "serious newspapers" has only one purpose, and that purpose is to create a vague impression in the reader that the G&M is not a "serious newspaper".

The reasons that no list of "serious newspapers" is provided (or ever will be provided!), are very simple. Such a list would open those "serious newspapers" to our criticism, and such a list would start to provide us all with a commonly agreed-upon list of sources that are "serious". No one wants that because the aim is not to discover and share truth, but to eliminate and destroy places to search for it.

If you look at the comments which eliminate or dismiss sources for information that have appeared over the years, you find that they've all be dismissed, all of them.

No list of "serious newspapers" can ever be provided, because that undercuts the rhetorical game of dismissing what's at hand.