License clarifications
The readme for this project states

> Remix Icon is licensed under the [Apache License Version 2.0](https://github.com/Remix-Design/remixicon/blob/master/License). Feel free to use these icons in your products and distribute them. We would be very grateful if you mention "Remix Icon" in your product info, but it's not required. The only thing we ask is that these icons are not for sale.

The Apache license allows reselling the work, with or without modifications. 
Is this sentence in the readme a licensing obligation, or just a non-binding ask that you make ? If you really want to forbid people from reselling the icons, then you cannot publish them under the Apache License.

This question has implications on the re-usability of the icons. If you didn't mean to distribute them under the Apache License, and you actually want them to "not be for sale", then they cannot be used in other open-source projects that have an Apache-Compatible license.  