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Aren't Guardian's journalists full time employees? Why is their salary being paid by an outside entity?

Not the journalists. The "experts" they are interviewing.

Edit: I was wrong. The journalists are also part time and work elsewhere:

No, see the entire thread. They claim article author's salary is paid by some Coefficient Giving organisation.

I edited it before I saw this. Yes, and there is an article on the media influence funding too: https://www.effort.news/tarbell