Around 15% or more of HN front-page submissions are to paywalled and/or general news sites.
(I've classified the latter in my analysis of historic HN front-page activity, I haven't gone through to specifically note paywalled sites.)
And tightening paywalls can have a large impact on submissions. After the New York Times strengthened its paywall in 2019, HN front-page submissions fell to about 25% of their previous level.
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