@jrt there is no such thing as "infection". Many license have limitations, e.g, attribution, including MIT and Apache, that can lead to copyright violation.
@federico3 ofc there is infection. If you have derivative work with proprietary bits you need to license the proprietary bits under a GPL compatible license. There was a whole drama about this with blender. https://code.blender.org/2019/06/blender-is-free-software/
I don't consider this a negative aspect of the GPL.
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