system
A chat on subreddit /r/wallstreetbets
human
Tech stock are often valued given extreme growth projections/estimates. A change in that can have big consequences. Not to mention another factor in the drop is that China was pretty close to Banning video games due to their effect on productivity .

gpt
some tech stocks have nothing to do with gaming like Weibo but they still dropped like crazy.  most of them have 'normal' growth projectios with PEs between 10 and 30 (check WB and YY)