Off topic but I guess it might be useful. YouTube channel RSS is https://www.youtube.com/feeds/videos.xml?channel_id<channel_id>, or with gnu sed:
echo '<channel_url>' | sed 's|https://www//.youtube/.com/channel/|https://www.youtube.com/feeds/videos.xml?channel_id|'






I use Proton but now I think if I’m gonna send mails to a Gmail anyway, there’s no much difference except for the subscription ones not being scanned. And for those sites that I have to enter an email, I use addy.io alias or Firefox relay.