While theoretically true, we live in practicality. Out of support means that when a vulnerability is discovered, it's not going to get patched, so people for ex

While theoretically true, we live in practicality. Out of support means that when a vulnerability is discovered, it's not going to get patched, so people for example write automated means to detect and exploit them, joining the computer to a botnet. And nobody ever is going to do anything against this at the source of the problem: the vulnerability. If you're interested in actual conspiracy, then I think that there is a bigger story. Many of the vulnerabilities of the current systems are actually already known (and exploited), just not by the creators of the systems. These exploits are either collected by state agents, or private entities that sell them as services to state agents - as they are basically munition, and so, of highest interest for people in power. Getting back to the original point, I don't think any software is ever secure. You take the risk the first time you fire it up. But the difference between using a recent iPhone, and an old PC with Windows 7 is that in the first case, you open yourself up to the NSO group, and in the second, that you open yourself up to hundred thousands of script kiddies and botnet recruiters out there. That is why it's recommended to use an up to date anything - or, if one likes to stay safe, not use any such thing at all.