Everyone just shows up in the same feed. USians are making posts in English alongside all the posts in Chinese. I've seen Chinese users making jokes like "Give me your data!" or "Welcome, I'm your new Chinese spy". I saw one comment on a post that read, "They better start posting in English soon." which, was getting heavily flamed. Lots of Luigi posting, it would seem. I also keep getting Chinese accounts posting a lot of really cool Socialist Realism art/propaganda posters, old and new. Lots of cringe USians making posts about being "refugees" on the app.
Keep the wall up, Mr Xi Jinping
At this point, the great firewall is protecting the anglosphere internet from a flood of people who would make it unusable to the anglos by being correct and not believing in insane conspiracy theories