It might sound strange to hear that Microsoft, a company who goes to great lengths to protect computers and networks, is one of the biggest contributors to phishing and fraud on the planet. It's true unfortunately.
They aren't actually committing the acts themselves of course, but they are enabling the problem by withdrawing support for standards designed to help stop it. Here's why this is such a big deal.
UPDATE 4/12/2023: After years, Microsoft is finally fixing this by honoring p=reject. This is a huge improvement and deserves to be applauded. The work isn't done though. We need aggregate reports to avoid blind spots during our implementation. Offering the reports for enterprises is a great step though.