I do not think that this is a Hotmail or MS issue. It depends on where you leave your email. Companies sell your email for advertising purpose. I have several hotmail/outlook email addresses but only one gets a lot junk mail. that is the one I use to register or shop with. My other emails I use for specific purposes only and I do not get any junk mails there.
Probably because both Microsoft's Hotmail.com and Outlook.com [not the installed Microsoft Office Outlook program] are now https://outlook.live.com/ and a favored target of any number or types of miscreants. E-Mail service provided by ISPs is not as well-known or visible to the public, mine gets very little SPAM, Junk or Phishing.
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