These patent seekers are almost like domain squatters, not adding value but wants to own an idea without actually producing a sizable market themselves.
https://blog.prusa3d.com/the-state-of-open-source-in-3d-prin...
It's worth noting that in 2022, Prusa had 0 patents assigned to them.
https://www.fabbaloo.com/news/which-3d-print-company-has-the...
P.S. I have no idea what patent practices are like in China.
Why does this suddenly make sense with the proprietary hotends and other magic...