Why should I believe your claim that AfD content is getting pushed on YouTube? Isn't it more likely that you personally hate AfD and so you find it salient and enraging whenever you see any AfD content at all yourself, regardless of exactly how YouTube's recommendation algorithm works on your account or whether they treat AfD particularly differently than any other political content? Are you actually measuring this?

To be clear I think it's entirely possible that YouTube is adjusting its recommendation algorithm to show AfD content to people more (or perhaps less) than would happen "organically", because AfD is a salient political party in German politics and YouTube knows this. But how do you determine what is the correct amount of AfD content to be recommended to people in a politically-neutral way, that doesn't end up amounting to you arguing that the YouTube algorithm is only fair if it censors political content you personally think is bad?