I spent some time trying to collect evidence linking Artia to the spam and abuse. I posted a comment about this in /r/VirtualYoutubers (Link for the comment), I will transcribe my comment but will redact somethings about past lifes/alts due to rule 2.
This comment is long so please take your time reading it.
Artia, livestreaming as the character connect to Hololive, says that she participated in a anti-Taiwan harrasment campaing and being proud of it, streamed May 20: https://www.youtube.com/watch?v=ul8E90RHAsI
Wiki about the forum she mentions (Di Bar): https://en.wikipedia.org/wiki/Li_Yi_Bar
The wiki also has information about the 2016 attack on Facebook that Artia mentions and participated in.
A Chinese post in Baidu gathering evidence that links Artia to Li Yi Bar, the forum that ignited the 2016 anti-Taiwan harassment campaign and that Artia mentions in the first video. http://live.baidu.com/p/6697065616
On October 21 Artia along with Doris watch "Wolf Warrior" on bilibili (https://live.bilibili.com/record/R1qx411c7fZ
Wolf Warrior is a nationalist Chinese action movie that coined the term "Wolf Warrior Diplomacy" that is an aggressive and confrontational diplomacy used by Chinese diplomats (https://en.wikipedia.org/wiki/Wolf_warrior_diplomacy
Artia and Civia talked about the allegedly leaked Aqua Cover of “Take Over” that was used as a rally cry for the spammers to continue with their actions. I can't find any HololiveJP, HololiveEN, HololiveID talking about the song.
The talents pages in bilibili “hijacked”, posting about the song and the spam bot:
Artia following and interacting with "@ywwuyi" that supports the harassment of Coco and is linked with the NGA board where harassment discussion is found.
Mutual follows of ywwuyi with Artia and Civia:https://en.whotwi.com/ywwuyi/mutual_friends
Tweet from Oct 18 (liked by a bunch of twitter spammers, day of Coco's return Asacoco):https://web.archive.org/web/20201107234403/https://twitter.com/ywwuyi/status/1317943492862070784
Tweet from Oct 19 (liked by Artia, day of Coco's return stream):https://web.archive.org/web/20201107234541/https://twitter.com/ywwuyi/status/1318122019280482304
Image prove of Artia like: https://imgur.com/a/i9oSoWb
Video prove of Artia like: https://streamable.com/e/fuwq70
As of 14/11 Artia still has this tweet liked, you can check it yourself.
Tweet from Oct 25https://web.archive.org/web/20201105024607/https://twitter.com/ywwuyi/status/1320524295295004672
Translate by another user
"FROM MY LIMITED MANDARIN: "These few days the traffic in the Vtuber section of NGA is even higher than the Genshin section, righteous men picking up the unicycle (the clown is using the unicycle, a symbol of sorts for the spammers I think), turning into 网暴man(probably meant spammer? ) for their beloved woman. 虫皇 (what the spammers call Coco), is this the world you want? I really like this sentence of yours, fxxk u and never come back. (Coco had this in her stream end card)"
Unicycle is the nickname for the spam bot, some machine translations also translate it to wheelbarrow.
Tweet from Oct 26, message of encouragement to continue the spamhttps://web.archive.org/web/20201026031614/https://twitter.com/ywwuyi/status/1320530300485595138