>Would love to know if this is in contract/writing somewhere as part of the acquisition.
Cloudflare would be insane to allow that provision in the contract or acquisition documents.
So I would take that promise as "will stay open source, blah blah blah, for now...."
Dropbox did it for Zulip.
It entirely depends on how much the seller cared to ensure continuity. It’s not like VoidZero didn’t have plenty of leverage; they weren’t a dying open source project.
What would they benefit from taking it closed source? And how would that even work for a JavaScript toolchain?