You will only get bad press. Much easier to let it rot.
2. Bad product management / development speed seems to be the case here, not rot or killing, as it seems it's actually not stuck on Python 2 anymore, or for long [1]
3. Even if neither of the two things above were true, I have seen no bad press on GCP due to this, and I'm a heavy GCP user, though just not in this niche. I've used Python cloud functions as well as GAE though.
[1] https://cloud.google.com/appengine/docs/standard/python3
I definitely appreciate that the core is open source, but using the open source version is less fun than it sounds. You really want to use the freeware proprietary VS Code to get a good experience.
If we're going to be using a proprietary text editor anyways, then I wish Sublime Text and its community were still as active as they used to be.
I can't think of anything off the top of my head that I'm missing in Sublime, anyway.