LWN is one of the, if not the single, highest signal tech publications around. I hope they're able to maintain a stable subscription service. Being user funded, and avoiding having to maintain allegiance to advertisers, is likely part of why their quality is so high.
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Not only that but lwn is one of the main sites that gets submitted to HN all year round (not daily, but maybe nearish to daily). So the audience here on HN has been exposed to it over the years. I'm not sure what more they could do to get new subscribers, I certainly hope they figure that out or how to get new ways to earn revenue without having to go the ad route.
https://news.ycombinator.com/from?site=lwn.net