Do people really still need to be explained why proprietary software is bad?
The degree of overreach by a US company, in this instance, is shocking. Yes, you can go spill a gallon of ink talking about how American software companies have been the tip of the spear for intelligence gathering, propagandizing, and sabotage. But I would say that an international business with a huge future stake in European implementation of their software spiking a criminal court's Outlook servers over prosecution of an ongoing genocide is a new low.
Open source proponents have tried to explain this simple fact for more than 20 years.
Open source is a far cry from bulletproof. We could just as easily see Mossad fucking with a poorly implemented Linux iteration of an email distribution agent. But then the assumption is that the Israelis - being heavily integrated into the European socio-economic system - are on Europe's side. Similarly, Microsoft and Google are supposed to be agents of the Big Friendly American Security State. The thing that shields you from the evil Slavs and Huns and Muslims, not the thing that stabs you in the back.
Part of this is corruption (Big Tech lobbyists effectively bribing public official to adopt their software), part of it is laziness (corporate sales reps go out of their way to make early adoption relatively easy and backload the real costs until later), part of it is the networking effect (thanks to the above there is an abundance of Microsoft-centric IT companies and experienced users who have already adapted to the privatized frameworks).
But this isn't a problem you can simply explain your way out of. Ultimately, you need a structural change in how these institutions do business. You need ICC that has insourced its IT and is capable of self-administration, rather than a bunch of outsourced flunkies who exist as a way to pad a contractor's wallet. You need a public that is adopting good IT practices at the grade school level, rather than feeding at the trough of private subsidies and philanthropies to defer the up front cost of technical education. You need an IT community that is well-organized and unionized and hostile to the corporate model of development and distribution of for-profit systems. Not a bunch of freelancers that see Microsoft Certification as a meal ticket.
But 90% of people simply don’t care even just a little.
90% of people (honestly closer to 99.9% of people) don't believe they have any say over IT policies at their own offices, much less at the scale of the a trans-national criminal court.
They do not genuinely believe they live in a democratic institution and roll over in compliance for fear of some form of reprisal, because that's how they've been trained to behave from their earliest days of life.
It isn't a matter of caring nearly so much as it is a matter of learned helplessness.
