[josephernest]

> CC wasn't suitable for software

This is wrong. CC is perfectly fine for software in some cases, such as here.

Ok, CC is not tailored specifically for software, thus the general advice "you should use something else" but I do not see why CC would not be suitable here to achieve OP's goals.

Can someone explain?

[bmelton]

Creative Commons' FAQ addresses this

    Unlike software-specific licenses, CC licenses do 
    not contain specific terms about the distribution 
    of source code, which is often important to ensuring 
    the free reuse and modifiability of software. 
    Many software licenses also address patent rights, 
    which are important to software but may not be 
    applicable to other copyrightable works. Additionally,
    our licenses are currently not compatible with the 
    major software licenses, so it would be difficult to 
    integrate CC-licensed work with other free software. 
    Existing software licenses were designed specifically
    for use with software and offer a similar set of 
    rights to the Creative Commons licenses.

[emacsen]

Software licenses, especially the more "advanced" licences such as the GPL, MPL, and others include very specific language around the issue of what is use, what is distribution, what is is connecting to, derived works, and importantly, around patents.

The CC licenses do an amazing job when it comes to artistic work such as books, movies, music, etc. but you don't have the same issues there, and that's why even CC says that they don't recommend using them for software.