A Thread Retention system sounds like a good idea.
The way they're copypasting random english words/phrases reminds me of the way CCP shill drones will copypaste random english gibberish (especially the rules of the stream) into Kiryu Coco's twitch chat during livestreams.
They do this because it clogs up the chat and keeps her from seeing messages by her fans in real-time.
Normally they'd spam chinese shit but then her moderators started banning chinese-spammers.
So spamming random english copypasted shit is their attempt to be less conspicuous than if they just typed "REEEEEEEEE FUCK YOU KIRYU COCO, HOW DARE YOU IMPLY TAIWAN IS A REAL COUNTRY BY SHOWING THE STATISTICS THAT SHOW WHAT PERCENTAGE OF YOUR VIEWERS COME FROM WHICH COUNTRIES! YOU ARE HURTING CHINA'S PRIDE AND HONOUR BY SAYING SUCH INSENSITIVE THINGS, SHAME SHAME SHAME!!!"
Lefties all think the same, even when they speak Bugmen instead of human. It's bizarre.