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YouTube is getting serious about blocking ad blockers
(www.theverge.com)
This is a most excellent place for technology news and articles.
I'm pretty sure modern programs by modern people are primarily released as Flatpak while every other traditional package manager comes second, if at all.
If you want to measure popularity, you can see the download count of programs on flathub.org . 550,000 installs of LibreWolf is not niche.