Direct-linking fonts should work fine, it's only if using 'assets.worlio.com/style'.
It's broken on my profile as well. It looks like it's going through the proxy, not assets.worlio.com directly. I don't think it's returning the original file correctly, images work fine but fonts don't so it can't be a URL issue.
downloadable font: download failed (font-family: "Nunito" style:normal weight:400 stretch:100 src index:0): status=2147746065 source: https://community.worlio.com/proxy/url/https%3A%2F%2Ffiles.gamebanana.com%2Fbitpit%2Fnunito-regular_1b89e.ttf%29%3B%0D%0A%7D%0D% … %0Ahr.miniSep+%7Bmax-width%3A500px%3B%7D%0D%0Ahr%7Bcolor%3A%23777%3B%7D%0D%0A%0D%0Ah1%2C+h2+%7Bfont-family%3ATransrobotics%3B%7D