Well, anything unpopular that doesn't use any software (even low-level software) that is also commonly used in popular environments. For example, game consoles, embedded devices or car entertainment systems often use outdated versions of popular browser engines. So to hack these, you don't need to be a highly skilled hacker, you just need to be able to try some older vulnerabilities.
And there are enough malicious websites that will just automatically check for these vulnerabilities. And then it's enough to accidentally open one of these malicious websites and even though nobody wrote the hack specifically for your car, you might catch some malware regardless.
For example, when GNU/Linux was unpopular, there was no malware for it; when it became the world's favourite server software or became a valuable target
I've been using Linux for almost 20 years, and AFAIK in all that time I've never encountered a Linux virus. OTOH when I run Windows, I hit a virus within the first six months.
Sounds like you have bad habits, I've had windows for years and no problems. Just scan with Defender after a download, occasional Malwarebytes scans to make sure, and you're pretty safe.
Most viruses are written for windows but that doesn't mean you're just instantly safe. You can bet as Linux grows they'll see far more.
Yeah last time I had a windows virus was because I got a bad Photoshop crack. But the virus was just a coin miner. Before that, I hadn't had a virus in 13 years.
With how much Adobe infects a system, leaving multiple different traces behind even when uninstalled, I think it's fair to say that Photoshop itself is almost a virus
Genuinely, how can you get rid of all that? How do you even find everything?
The Win10 iso that I definitely legitimately purchased has a ppApps folder that has Photoshop in it; I've always just assumed I would be able to delete it from there.
If you don't have it portable-ized, though, Revo Uninstaller might help. (though I never used it for long enough for the trial to run out, so I don't know how much it costs)
— When the Indian Amazon support guy sees you're a junior on your first week and tells you to execute a script to install a software for a video call with him. And you do, but it needs sudo access, so you give it...
— You have sudo power here
Sadly, true story. I never told anyone. My neurons clicked a day after that and I removed everything from the computer. It was too late, they hacked some things but IT just laughed and recovered some backups. They never knew I was the virus all along.