It would be possible for people to fork the community edition (https://github.com/JetBrains/intellij-community https://github.com/JetBrains/intellij-community)

It would be possible for people to fork the community edition (https://github.com/JetBrains/intellij-community https://github.com/JetBrains/intellij-community) and try and rebuild the most popular ultimate features.