I'm not sure that's true. It seems very popular in OSS in general but not much enterprise/commercial uptake.

I guess node has taken some market share it seems like

What else is using it and popular? Mediawiki - that's true. And some forums, but forums aren't popular any more.

	▲	whycome 2 hours ago \| parent \| next [-]
		No way. Forums are still incredibly popular. Something like RedFlagDeals has an entire business based around their forum and get close to 40m page views per month and more than 3m uniques. And there are at least 3 other hugely popular php based forums that I occasionally check — and those are just for my own niche interests.
	▲	dvdkon 2 hours ago \| parent \| prev [-]
		Nextcloud, the mentioned Roundcube, plenty non-Wordpress CMSs, many internal tools I work with daily...