As someone who has worked in the tech industry near Seattle, I don't know how well known it is to the wider populace or people in Europe, but open source is absolutely anathema here. It's seen as insecure, unstable, and unreliable.
I work in IT so I've tangentially worked across a number of sectors supporting their stacks and it's pervasive within the American culture. There is a major de-prioritization of in-house IT knowledge and sysadmins in favor of enterprise support contracts. When shit hits the fan, it's less important to have a knowledgeable team and more important to have a foot to stamp down on until the issue is resolved. Often that foot has another foot that stamps down, onward and onward until someone manages to engage the MSP or cloud provider that set the service up initially with their scant documentation.
It's a nightmare both for tech workers and from a cyber security perspective. A lot of this contains my own personal bias and perspective on the matters, but let me say, I have stared into the void and I can't stop screaming.
I cannot upvote this enough. "Just migrate to X, it's every bit as good!" when end users know it's not is a disingenuous argument and even if they don't have the technical know-how to explain exactly why they feel this way, they'll feel the deception. It only reinforces a growing distrust in tech.
The argument has to be made honestly. It's not quite as good, but almost. Those few things you'll miss will require an adjustment, but the overall value (a lot of times just literally, it costs less!) will become evident.
I know we're all Linux nerds here and enthused to get people onboard, but the battle right now we're facing is one of trust and security and must be grounded in those notions because while great strides have been made in convenience and accessibility, big corps will always be able to bankroll themselves over those points.