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Well I guess he might, he was instrumental in GNU GPL after all. But I couldn't find evidence of that claim.
The best I could find was this: https://stallman.org/articles/online-education.html
However it doesn't apply, he's talk about the problem of commercializing academic work licensed under non-commercial CC licenses.
If he's against them then it's ironic as on his personal website his photos are licensed under CC at the bottom:
Verbatim copying and redistribution of any of the photos in the photos subdirectory is permitted under the Creative Commons Noderivs license version 3.0 or later. You can copy and redistribute the photo of me playing music to the butterfly under the Creative Commons Noderivs Nocommercial license version 3.0 or later. Any other photos of me in this (the toplevel) directory may be copied and redistributed under the Creative Commons Noderivs license version 3.0
😂
https://web.archive.org/web/20060815083329/http://www.linuxp2p.com/forums/viewtopic.php?p=10771
Check that out!
And yeah, I think it's fine to use whatever license you want.
Just so long as you read it and agree first. =D