I mentioned some of this censorship in https://news.ycombinator.com/item?id=14403809. A tieba (your random big BBS site; https://archive.fo/0mh1t#selection-4961.0-4961.16 reply #10) link from http://archive.is/tTgsx (solidot, Chinese version of slashdot) points to a ban on mentioning Google by name & doing commentary on AI, and suggests doing a indirect livestream by showing a separate board instead. Someone's YouTube livestream mirror on Bilibili was supposedly taken down after the B site made it too public by putting it on the front page.

According to the tieba page, the ban was first noticed as CCTV5 deleted their Weibo (a microblogging service) post on the livestream.

Welcome to the 4th part of confidence doctrine -- cultural confidence.