We need more Red Hat and less Microsoft in the on-prem enterprise business. These exploitable vulnerabilities are unacceptable when your customers are the likes of DoD. No one considers Google anything less than an impenetrable fortress, but when it's some government entity responsible for keeping American lives safe it's like "ah yeah they probably have a vulnerable on-prem Sharepoint that could easily be pwned." So…
Security aside, what even is an alternative to SharePoint on Linux? There is not one.
https://www.liferay.com/resources/l/content-management-syste...
https://hub.docker.com/r/liferay/portal
I haven't played with it in about 5 years but it was substantially less polished than a well-run Sharepoint 2013 instance.