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This works very well when there's a clear non-partisan issue with the text, like a logical inconsistency or the citation doesn't line up with the claim or the prose is just sloppy or unnatural.
If someone is trying to push biased sources, good luck.
The I-swear-it-isn't-a-cabal of highly-active editors knows policy better than you do, and they will continue to conveniently know policy better than you do no matter how much time you spend studying it. (And if you study it and then try to do your business anonymously, they will consider it suspicious that you know anything about policy and demand that you log in to your nonexistent long-standing account.) And that policy allows them to use highly biased sources because they are on they "reliable sources" list, except it isn't really a single list but rather some sources are restricted in applicability, unless it's one of them using it inappropriately. And the bias of those sources doesn't disqualify them as long as it's properly taken into consideration by whatever arcane rules, except this doesn't happen in practice and nobody will care if you point out them doing it, as long as it serves their purposes.
Meanwhile, the way sources get approved as reliable is generally that they agree with other reliable sources. Good luck trying to convince people that a source has become unreliable. You aren't going to be able to do it by pointing out things they've repeatedly objectively gotten wrong, for example. But they'll happily spend all day listing every article they can find that an ideologically opposed source has ever gotten wrong (according to them, no evidence necessary).
And it all leans in the same direction because the policy-makers all lean in the same direction. Because nobody who opposes them will survive in that social environment. There are entire web sites out there dedicated to cataloging absurd stuff they allowed their friends to get away with over years and years, just because of ideological agreement, where people who dispute a Wikipedia-established narrative on a politically charged topic will be summarily dismissed as trolls.
On top of that they will inject additional bias down to the level of individual word-choice level. They have layers and layers of policy surrounding, for example, when to use words like "killing", "murder", "assassination" and "genocide" (or "rioting" vs "unrest" vs "protest"); but if you compare article titles back and forth there is no consistency to it without the assumption of endemic political bias.
WP:NOTNEWS is, as far as I can tell, not a real policy at all, at least not if there's any possible way to use the news story to promote a narrative they like.
And if the article is about you, of course you aren't a reliable source. If the Wikipedians don't like you, and their preferred set of reliable sources don't like you, Wikipedia will just provide a positive feedback loop for everything mainstream media does to make you look bad. This will happen while they swear up and down that they are upholding WP:BLP.
I've been watching this stuff happen, and getting burned by it off and on, for years and years.