I have a team with members in both Hong Kong and Shen Zhen. We have done some testing recently:
- Trello web is able to be accessed in HK and SZ
- Trello app ( Android ) cannot be downloaded officially due to Trello website point user to Google Play store that cannot be accessed in China
- HK team downloaded and installed Trello app ( Android ), and extract apk file, and send to SZ team. SZ team able to install app, but unable to startup. The Trello apps quit after launch, there's even no login page shown.
- HK team try to use VPN apps, so to pretend to be in China, and try to install and start the apps, fail also.
- SZ team use Edge, Firefox to open Trello website successfully without problem
Conclusion: For starting up Trello apps, we guess there is access to some site that is blocked by china, so that the apps cannot be loaded in china successfully.