I will make it straight and simple.
1) We use third-party icons from The Noun Project. We use their Pro API which gave us the right to use and sell the icons in part of the logos. Those icons are from thousand designers around the world. Normally when a designer uploads an icon on The Noun Project, they gave their IP. But, how can we be sure the icon uploaded is really their own creation? We can't.
2) We use hundreds of fonts. We check the license for all of them. But even with that, there is still a small risk of license infringement.
3) Thousand of logos are created every hour on LogoFox. Some will probably look similar to existing logos out there. For obvious reasons, we can't personally take the liability for the logo generated on the site. You have to make your due diligence.
Those 3 reasons mainly explain our current terms. This allows us to protect ourselves from any liability problems that may occur. Those liabilities also exist with a logo designed by a logo designer. The difference is, we don't deal with one logo a week but with thousand. So we adapted our terms accordingly. I hope you understand.
TLDR: no matter if your logo comes from a logo maker or a designer. You have to make your due diligence.