I totally grasp the situation. The same could be said about notepad.exe, the File Explorer and everything else that comes preinstalled with Windows. According to the preinstalled logic, Windows should just be delivered with a kernel to even the competition.

AFAIK Slack is a Startup, backed by VC. If we would speak about Sublime Text vs. Notepad.exe, we might have ethical/moral grounds for a discussion.

Edit: ... and just to be more clear: We have SublimeText, Directory Opus etc. - great software from great teams, which can survive although they compete with preinstalled software on Microsoft Windows. If Slack would provide something really valuable, Teams wouldn't have had such an easy play. Same is true for Zoom.

Microsoft does Microsoft things.

I complain about the EU and my own technical incompetent government for a simple reason:

For years now, we have Open Source Software that is good enough (TM) for the public sector, and for example the French police showed already that you can move to Linux (https://www.zdnet.com/article/french-police-move-from-windows-to-ubuntu-linux/).

The EU should get independent of Microsoft for something so important like the IT infrastructure, instead of painting lipstick on a pig.

Edit: And if the EU is independent from Microsoft, I would prefer to use a messaging system like Matrix instead of blowing money into something like Slack.