Look into yt-dlp and ytdl-sub (linux) ytdl-sub basicly an text based interface for ytdlp can be used to help automate the process and is a little more human readable and easier configure.

Had a similar issue with Google flagging my subdomains as malicious, even though they are only used inside my network and not even reachable (much less resolvable) outside. Ive submitted multiple times and it has come back several times 🤷‍♂️🤦‍♂️