The email provider does NOT run only free software. NO computer in this world
does that as of today. I wonder why it is so difficult for most people here
to understand this.
I wonder why it is so difficult for you to understand that it is *not*
quantumgravity's point. He even started his reply to your question ("which
online service provider runs on RYF hardware with FOSS firmware and
software?") with "No, that's not at all the question". The central point of
his reply is:
Even if he does run only free software, he could still mistreat you by
copying your mails, reading them, selling your data etc (just examples here).