It become heavily biased in last years indeed.

If something looks controversial for my tastes, I track when the change was made and look for last version before dubious content was added. And so, I've seen edits done to media-related articles which introduced sections that weren't present in some cases for even 20 years. Sections being replaced or included because there was a need for including particular bias prevalent in the namely United States sociopolitical scene in last 15 years. My country's wiki did suffer as well and there are ongoing edits replacing grammar to fit unjustified trends that damage our language. In the past hot topics which were controversial IRL were including "the Catholic Church's position" - now that's largely gone. Then, it's even impossible to edit articles without being logged in because the most popular ISP has blocked all IP ranges - all because a "trend" of vandalism that happen around 24 to 25 years ago, and which supposedly happens again according to the message presented.

My contributions weren't large and I stopped doing these quickly because fighting people who unload their complexes on the Internet on total strangers weren't worth trying to improve articles about e.g. Milky Way galaxy or some generic local non-political stuff.

Wikipedia looks good on a paper and surely it works for trivial stuff people all around the world can agree upon. But it fails whenever there's a possibility of endorsing a point of view, which is always disguised as "neutral", which applies to probably 80% of articles on English Wikipedia alone. It suffers same degradation as nearly every place on the Internet - just not from the usual ads and tracking .