Nanoleaf
Nanoleaf is using GPL software in their smart home products based on OpenWrt and do not contribute back the GPL source code, or allow users to run their own software on their hardware. Nanoleaf products are highly popular with many YouTubers using them in their backdrop.
https://forum.nanoleaf.me/forum/community-support/usage-of-openwrt-and-its-copyright-license https://www.reddit.com/r/Nanoleaf/comments/mbhudb/nanoleaf_aurora_run_linux_openwrt_and_nanoleaf_is/ https://forum.openwrt.org/t/nanoleaf-light-panels/81748