You might read the “reception” section of their Wikipedia article
The same link literally says:
Wikipedia editors consider Media Bias/Fact Check as “generally unreliable”, recommending against its use for what some see as breaking Wikipedia’s neutral point of view
I like how you gloss over the six paragraphs that say “academics and researchers generally agree that it’s pretty good and reliable” and focus on the single sentence that says “Wikipedia people don’t use it on Wikipedia”.
The same link literally says:
I like how you gloss over the six paragraphs that say “academics and researchers generally agree that it’s pretty good and reliable” and focus on the single sentence that says “Wikipedia people don’t use it on Wikipedia”.
As you glossed over the bits that said it was unreliable to focus on the ones that said it was reliable.