You only have sympathy for people who are already technically competent to some standard you've chosen? It's those who don't have technical competence that this shit works on. I'd bet that's the reason a wallpaper app was chosen for these shenanigans, because it filters out the people who will be wise to it.

Like it or not, building a secure internet means making systems that are safe for regular internet users, and if you're getting snooty about the kinds of programs a person installs, I'd wager that's not you. Even if it's just the least competent 5 or 10% of the internet falling prey to this, it's the predators that make the environment more dangerous for everyone. Put the blame where it belongs.

Also, those people aren't using Linux partly because Linux is an elitist community that shits on anyone who's not comfortable in the command line. If you want Linux to be a viable threat to the Windows monopoly, you need to accept that these people will need to be accommodated, unless you're happy selfishly keeping it to cloistered group of nerds who are toxic towards every newcomer, and you think that's the way it should be. I've certainly met Linux people who think that way.