On the other hand, the GFW excluding much content from outside China makes the China Internet experience particularly Chinese and not the "real Internet".
Off the top of my head, losing access to any of the following platforms will hamper your professional development: Github, Stack Overflow, cloud services leaders (AWS, GCP, MS Azure, etc.), Coursera, Udacity, Youtube, Khan Academy, Google Search, Google groups, Slack. At best, you'll have to use a VPN, or maybe resort to a domestically developed and probably inferior alternative. At worst, no such alternative exists.
PRC have proven repeatedly that they can and will arbitrarily block foreign services without notice. Slack works today, but how long until they decide that Slack facilitates too much discussion about Falungong, Tibet, Xinjiang, Taiwanese independence, or Tiananmen?
What ways are that? We do know about sneakernet and emailing tarballs, but I guess it has to be something else? I'm curious.
It's not that difficult to set up your own git remote. But if you don't have access to documentation for your libraries it really becomes tough.
In the West we have the choice to use the service that gives us all these benefits. Mmm, choices.