It is quite famous to most english-speaking communists (and they even have other language instances) but the MIA has been known to edit out content they don't like and not telling anyone. I talked about this in this essay: https://en.prolewiki.org/wiki/Essay:Design_considerations_for_our_new_library
We're trying to do better with ProleWiki's library, including adding TTS eventually. But we don't have nearly as much content as they do on our library (they've been doing this for over 20 years, and we've been doing it for 3). And sometimes we have no choice but to pick from MIA as we can't find a document somewhere else. We do include where we source our documents from as much as possible though, so readers can quickly see if they came from the MIA or elsewhere.
Link to our library: https://en.prolewiki.org/wiki/ProleWiki:Library