It's always worth remembering: Google couched leaving China in 2010 in humanitarian / ethical terms, but the reason they left was extremely clear: they got hacked internally by Chinese agents using physical access to the intranet. While Google got their security house in order, the most prudent course of action to protect their own company (including their employees) was to cut that physical access.

Google restarted business in China around the same time it was able to bring the BeyondCorp initiative online.