The license is short and to the point: https://pictonic.co/license

> ONCE PURCHASED You CAN: Use the icons for any personal or commercial projects. Modify or alter all icons in any way you wish. You CANNOT: Under any circumstance, you must not reproduce, resell, rent or publish Pictonic icons. Let’s be nice!

But that last sentence in the license ("Under any circumstance, you must not...publish Pictonic icons") is subject to misinterpretation, no?