[Dev] Is Iridium safe to use?

[happy gnu]

I read a thread about Chromium having issues to be considered free
software. But what about iridium? 
https://iridiumbrowser.de/downloads/linux.html

It is listed on the FSF directory:  https://directory.fsf.org/wiki/Iridium

But as it is based on Chromium and you have discussed this before, I
wanted to ask your opinion.
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