Is the IPA Font License truly open source?

Hello,

In March 2024, an incident occurred where the operator of a web service 
converting IPA fonts licensed under the IPA Font License to WOFF format 
received a warning from the IPA to discontinue the service.
In response, questions have arisen within the Japanese-speaking 
open-source community about whether the IPA Font License fundamentally 
meets the definition of open source.

I can provide several documents related to this matter, but I lack the 
ability to translate them into English.

https://moji.or.jp/2024/03/01/ipa%e3%83%95%e3%82%a9%e3%83%b3%e3%83%88%e3%83%a9%e3%82%a4%e3%82%bb%e3%83%b3%e3%82%b9%e3%82%92%e5%b7%a1%e3%81%a3%e3%81%a6-2/
https://x.com/shujisado/status/1765541973203853320
https://mandel59.hateblo.jp/entry/2024/03/07/010127
https://x.com/search?q=ipa%E3%83%95%E3%82%A9%E3%83%B3%E3%83%88%20%E3%83%A9%E3%82%A4%E3%82%BB%E3%83%B3%E3%82%B9&src=typed_query&f=live

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