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Presumably because they don't actually want to license their project under the GPL.

LGPL doesn’t require them to license their project under GPL, it’s more permissive than you seem to think: https://fluendo.com/en/blog/gpl-vs-lgpl/

Ah, I either didn't see the L or you edited it in after I already started replying. I thought Qt was plain GPL.

LGPL only stipulates that users have the freedom to link against their own version of the LGPL library you're using. You don't have to open source anything if you don't want to.

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