I work for an Australian org with about 20k seats.
We have on-prem Confluence and Bitbucket.
Well, until we complete our migration to Azure that is, which was entirely in response to Atlassian's forced migration to their cloud. Our organisation took the attitude that, since we are being forced into cloud anyway for wiki/GIT, we may as well do that migration into a cloud provider we already have substantial business with anyway. I mean, the only Atlassian business we had was on-prem wiki/GIT, while we have other substantial Microsoft business with Windows, already moving some customer-service workloads to Azure hybrid/private cloud, outlook, teams, probably heading to O365 as well. And it's a lot easier to migrate wiki/GIT to a different provider (Azure) then it would be to migrate all the other Micrososft-provided services to Atlassian.
I don't like Microsoft (I originally came to the Register to follow the MS anti-trust trial of the late 90's), I'm an open source/Unix/Linux (I was a Solaris admin on Sun SPARC machines in the 90's/early 2k's), enthusiast. But even I, a die-hard anti-MS person, and my preferences to 'buy Austraian' where it makes sense, couldnt argue in the face of Atlassian's customer-hostile position against this migration with a straight face.
Atlasian, at least where my 20k seat organsiation is concerned, cut their own throat.
Fuck Atlassian for forcing me to use more MS products.
(although I have a feeling a lot of open source wiki's are goint to start popping up around our org as IT teams roll their own wiki's rather than go to Sharepoint or other MS products)