Are you suggesting that fact-checkers are responsible for giving you the news too? That’s not their job.
They both do the same thing. Only the fact-checkers do so reactively.
Individuals don’t have the time, energy, or know-how to do proper fact-checking on an entire news site
Then how do they determine if the “fact-checker” is trustworthy? If I start a “fact-checking” site today, would you just instantly trust me to report only facts and be unbiased?
This multiple sources argument also goes for the fact-checkers, where they should mostly agree.
…why should they agree?
You seem to be suffering from the idea that “fact checkers” are somehow inherently more trustworthy than the publications they check. Do you think the publications themselves don’t have “fact-checkers” on staff?