"Microsoft Discourages Employees From Using Slack, AWS & Google Docs" is shorter and seems more accurate because of Slack not actually being banned. The actual

"Microsoft Discourages Employees From Using Slack, AWS & Google Docs" is shorter and seems more accurate because of Slack not actually being banned. The actual bans all appear to be for legitimate compliance reasons rather than "don't use competitors", even Github is banned “for Highly Confidential types of information, specs or code” though they presumably have an on-premise instance of Github they use for that.