Where is the equivalent tech on the Linux side that Red Hat developed? They simply didn't have a competitive enough alternative. Usually anything outside of cloud/web server space, you'd find alternative open-source projects rotting with non-clear ownership and year old last commits. Red Hat and Linux world weren't interested in developing those things. They weren't interested in making competitive user friendly alternatives that enabled non-programmer users. It is hard, thankless, soul crushing work that nobody does anymore since Microsoft bought or eliminated them. There are simply no equivalent alternatives in the open source world because competing with Microsoft requires accepting significant losses as a company for a long time. Google Workspace is a thing only because Google can finance its developers with ad money.
Just having Linux is no golden key to security either. You need to put the exact amount of barriers in front of your on-prem servers regardless of the OS.
The whole security mess is just the symptom of capitalist economy. Most companies give 0 fucks about it because caring about security is costly and time consuming. With the race to the bottom for first-to-market, caring about security is a risk, it is a distraction. They ignore it until they establish a position and maybe their misdeeds become a liability. However, no company got actually severely punished for not caring about security. So it is still seen as cost by many.