I can't speak for the ones concerning YouTube and Google Ads because there certainly are some big problems with those platforms, but as for the search results, I wouldn't say it's necessarily biased, but it sure can be circumvented(I personally have a good grasp on internet marketing in general). The search results are mostly managed automatically by Google's algorithm and not manually by people, hence, as with most software, there will almost always be loopholes.
P.S.:
https://github.com/gorhill/uBlockAs YouTube and Google Ads are both part of the Google corporation, I'd have to assume (especially as there are some very obvious differences between what, for example, the automated suggestions provide on DuckDuckGo vs Google - some of the DuckDuckGo suggestions are 100% in the top on Google too although they do not appear unless you type them yourself) that the search is flawed too.
One very quick and interesting example I've seen on Twitter is that if you go over to Google and search for "reddit conspiracy". Putting all the conspiracy tinfoil hat and boogaloo stuff aside, you'd logically have to find the Conspiracy subreddit (like I used to find months ago) on the top. However, while DuckDuckGo gives you the sub as a top suggestion, Google now redirects you to the Coronavirus sub and "conspiracy debunked" articles. This gives me a quite strong hint that the algorithm has been influenced to hide specific results. I mean.. it's written by man, right?
Now looking back at this thread, my previous statement might make sense. Although it's an algorithm that sure is very intelligent and learns a lot from our interactions with Google's search results, it could be modified if Google ever decides to be biased in a situation such as the one we're currently talking about.
Doesn't surprise me that search engines sometimes give you the wrong results intentionally. If there's one thing I have learned, it's to always take infomation with a large grain of salt and verify it yourself. But that's too much to ask from someone nowadays, especially as most people only read clickbait article titles and share them without even reading a paragraph or two out of them.