Article by TheGamer, referred by an r/FreeMagic post containing full details. I know nothing about MtG and defer to that + related threads, articles, or videos.
Summary:
WotC was planning a major competitive format change, but didn't intend to announce it until maybe 2 weeks after sharing it internally, which included contracted Magic Pro League players.
This was shared to and leaked by an external party, Austin Bursavich, a well known competitive MtG player NOT under an NDA. Furthermore, his actions did not violate WotC's Code of Conduct[1].
In retaliation for Bursavich not outing his sources, WotG banned him indefinitely.
[1] - Wizards Of The Coast Ban Player For Refusing To Snitch by Richard Lewis
[–]spez_is_a_pedophile 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 0 fun3 insightful - 1 fun - (0 children)