I'm requesting that if files end in "Sponsorship.pdf.run", ".pdf.scr" or ".txt.exe" would make a window appear, warning the user that the file seems to be masquerading as another file type. Even though Linux distros in general are mostly unaffected by phishing emails, the user could just think that Plasma is wrongly trying to open the pdf as ".exe", then the user would transfer the file to a Windows computer, infecting it. Perhaps this should happen for any file with multiple extensions, but maybe they aren't all inherently suspicious.
This *can* be a source of suspicion, but it isn't necessarily problematic. For example in the FOSS world, it's very common for archive files to have the .tar.gz extension, which definitely shouldn't trip this. What matters here is really whether an *executable* file is masquerading as a normal file. And we already have a popup for such files when you try to open them.