I really wish I could try it out without having to sign up for an account. I understand compute costs for that would likely be high, though.
A bunch of JS on a CDN doesn't cost that much to serve, if it's running on a remote server Stadia style than yes, but then what is the goal here? User/Customer acquisition always costs a lot of money...
At the very least, let me test the editor quickly, and prompt me to register upon saving a project.
edit: I always thought it was stupid that Stadia didn't provide tools like Blender, Gimp and co, it would have been a huge avenue for user growth. Then strike deals with Maxon for instance and run Cinema 4D in the cloud, that's a missed opportunity.
Colab allows that, you can run Blender in the cloud and basically use the service as a rendering farm, and it's damn fast. No GUI obviously...
Even on Android, it took them 10 years to provide what is basic tooling for game development on other platforms.
Games succeed on Android because of the game development community standing in for the lack of motivation and tooling support from Android team, not thanks to them.