Maybe they don't do sprints.
Yeah, could be user feedback. And if it's a public beta release why not?
3 devs working for 5 days on each their feature means 3 releases per week.
For the last 10+ years I have been working on the same project with 2 releases per year, so what do I know. But I have used projects with quick release cycles that work very closely with the community. Push new beta, feedback on discord. Was also fine from my (limited) perspective.