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GPL does not virally spread to other projects on your hard dive, nor has it ever required anyone to submit code upstream.
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Didn’t say it did, but it doesn’t stop the zealots from harassing you to open code you don’t have to (more stories than I can recount over the last five years). GPL is fine. It’s GPL people that are batshite crazy insane.
RMS demanded that OpenOffice not list non-free addons on their website. It’s that sort of crap I don’t want to be near. You deal with anything GPL and woe betide you if you want to make money out of it, or mix it with closed software.