I'm guessing he didn't care all that much. Lots of people didn't. Still don't, it appears. Including government officials, who do it themselves.
Why did Obama lie when he was asked if he knew about Hillary's server?
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Obama Used a Fake Name To Send Emails To Hillary’s Private
https://www.dailywire.com/news/9470/obama-used-fake-name-
send...
September 26, 2016. President
Obama has been directly implicated in
Hillary Clinton’s controversial private emails, according to documents recently released by the FBI.
Sending emails to then-Secretary of State
Hillary Clinton under an alias,
Obama may have knowingly sent classified information through a poorly-secured private
server.
************
Obama used a pseudonym in emails with Clinton
https://
www.politico.com/story/2016/09/
hillary-clinton-emails-fbi...
It's been known since last year that
Obama and Clinton corresponded occasionally
via her private account, but the White House has insisted
Obama did not know she relied …