What does "censored" mean in this context? No anti-communist or anti-party propaganda?

Personally I feel that Google has slowly become more and more censored over the recent years, to the point that I do searches on multiple search engines if I'm not so sure about the Google results.

More than often there's not only a filter-bubble in my results, but there's more and more sites that suddenly disappeared over the years, but are high-ranking on DDG, Bing, Yandex, ... — especially in February / March 2018 there was a kind-of-extreme disappearance of sites in the results where I previously used Google to get to them.