In most cases, the warning appears for two specific reasons:
DaFont hosts both old and new font technologies. Sometimes, older .ttf files don't play nice with modern, cloud-based apps. If the software finds the file "unreadable" or "corrupt," it defaults to a system font to prevent the program from crashing. 4. Cross-Platform Sharing
"Font substitution will occur" is not a death sentence for a font, but it is a shot across the bow. It tells you that the designer did not prioritize technical standards, only aesthetics. If you are a casual user making a digital graphic for social media, the Character Map copy-paste method will save your project.
