Have you read it?
"Iridium has Google Safe Browsing enabled by default. This means within 5
minutes after start and then periodically every 30(?) minutes, a request to
iridiumbrowser.de (keeps a cache of the GSB data) is made to update the safe
browsing database."
I am so sick of that "safe" monitoring and all the justifications for it.
Also (as discussed previously) if they are scraping and keeping cached copies
of GSB data on their site that seems to be a legal issue because it conflicts
GSB's terms:
https://developers.google.com/terms/#e_prohibitions_on_content
BTW there is also:
https://github.com/Eloston/ungoogled-chromium
which disables safe browsing.
I have not tested any of these two.