It's probably because those with decision making authority have no idea what open source is and how it works.
That being said, China is a huge contributor to open source. For example Huawei and Alibaba are among top kernel contributors.
Steam usebase is huge, around 20-30 million active users at any given time (probably much more in total). They need to ship a lot more Decks to have an impact on the statistics.
But on the good side, there is this: https://www.gamingonlinux.com/2022/06/valve-to-ship-more-than-double-the-number-of-steam-decks-each-week/
Here are some google alternatives:
Brave Search: https://search.brave.com/
SearX instances: https://searx.space/
Huawei is not the only one. Almost all software companies have some KPI that employees are farming. (speaking from experience here)