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This seems to be an issue purely with the title on HN? I haven't been able to find any references to futo themselves calling it open source.

In this YouTube video, https://youtu.be/5DePDzfyWkw?si=hkAalkXqA5HGp97c Louis rossmann(FUTO's paid employee) claimed that it is open source(when it's clearly not)

I think you misspelled his name. It also doesn't sound like you listened to what he had to say about the license. I suggest you do.

It's not open source by the most common definition provided by OSI. It's source-available at best.

Sorry. Didn't mean anything malicious by it.

I know,not your fault, you were probably misled by Louis Grossman 's youtube video https://youtu.be/5DePDzfyWkw