Wikipedia survives while the rest of the internet breaks

Wikipedia has plenty of propaganda. It's often at the fringes of knowledge, in niche subjects where there isn't yet an established group of proponents and detractors. It can be quite subtle too, will fool most laypeople, even those who are otherwise intellectually savvy.

It's only when a subject becomes popular that the propaganda gets recognized and rectified.

And? Share an example. This reads like conspiratorial thinking without any evidence.

Many countries in Eastern Europe have radically different interpretations of history. The nationalists from each country will try to establish their own ethnicity for persons of interest. They will try to add editorial comments or hyperpartisan sources to all kinds of historical articles. There are edit wars about what language to use for what city in what era. I would guess that this is the case for many other regions of the world.