This is the emails between the YouTuber YGK3D and Anycubic, it seems like they won’t send 3D printers to reviewers who mention their GPL3 license violations.
tl;dr Anycubic uses open-source software for their firmware, but doesn’t make it public as per license agreement, and they don’t seem to be friendly to anyone who calls this out.
More info: https://www.youtube.com/post/UgkxIMpZTkXqFo0H6pDwhZpdYqMYvLhPvWA5?lc=UgxA-4LYvwrnonXuXsZ4AaABAg


Here is a sloppy iPhone text copy from the photo, for anyone else having trouble reading on a small screen. OP, feel free to add this to your post to make it easy for others to read.
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Update
Here is the text shown in the video when Taylor first contacted them about the licensing compliance.
and for anyone here using Linux (including Linux phones), an app called Frog does the same text extraction thing
Damn. Should have come to the comment section first, I guess. That blurry image was a pita to read.