Because the product TikTok itself, is not targeted at users in China? TikTok is more like "Douyin International", or say, there is a separate "TikTok China" named Douyin. So whether these cloud services operates in China is irrelevant.

Its China version Douyin also uses a mix of Aliyun and their own infrastructure, so ByteDance likely have plenty of experience operating in multi/hybrid cloud environment.

I know that TikTok isn't operated in China but If I were TikTok dev, I'll think something like: adopt AWS/Azure to make possible to share code between Douyin and TikTok (just possibility, for future).

I also suspect that Google Cloud's learning resource in Chinese is fewer than AWS/Azure.

> Google Cloud's learning resource in Chinese is fewer than AWS/Azure

Yes, that's true. But it's not like there are a lot of learning resources in Chinese for AWS/Azure, either. At least compared to Aliyun (Alibaba Cloud). So likely it doesn't matter.

AWS is pretty much blocked in China, the China version and Azure's are what can best described as locally owned franchises.