My biggest frustration while browsing in China was reCAPTCHA. Most websites would load fine, but then they would detect that I was in a new location and this would trigger their account protection bullshit and ask me to complete a reCAPTCHA that...wouldn’t load. This happened ALL THE TIME and is just excruciating.

Sometimes there wouldn’t even be UI that would load to indicate something was wrong. Logins would just fail with cryptic messages.