also I’ve heard of comic book review channels on youtube getting flagged by manga publishers for showing book interiors

I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:

• yewtu.be
• inv.nadeko.net
• yt.artemislena.eu
• piped.video

https://fit.princeton.edu/publications/who-owns-sentence-history-copyrights-and-wrongs