We fund the project entirely from sales of the Confluence integration.

Just to extend the conversation, the change implements one thing, it protects our revenue in the atlassian ecosystem.

What it does it protect the future development of the project by protecting the revenue. That's more useful to you than the license being fully open source.

The primary losers of this change is anyone wanting to integrate draw.io into the Atlassian ecosystem.

I mean this does seem kind of fair. I'm not familiar with Confluence and Atlassian but it seems something mostly aimed at corporations, I'm not sure of how common it's use is and how much is affected by this though.

I'm okay with something being 98% open source so they can survive on the extra 2%. And I much rather specific non competes for certain platforms then broad non-commercial clauses.