Wordpress is a significant part of the internet (hobbyist and small business definitely) and it still blocks SVG by default due to security concerns because SVG

Wordpress is a significant part of the internet (hobbyist and small business definitely) and it still blocks SVG by default due to security concerns because SVG images (like fonts) are essentially scripts/programs, not images. There are various potential vulnerabilities due to this and you can sanitise images or use correct headers to mitigate the issues, but it's easier for many to just say no and sidestep the issue.