An old way of exporting YouTube subscriptions to RSS feeds is to go to the Subscription Manager page of YouTube and simply click the
Export subscriptions button to download the exported
Currently, I cannot do it.
So, here is a workaround I found from the Internet.
$$("#main-link.channel-link").reduce((str, el)=>str+'\n'+el.href)to receive a list of YouTube channels and users you subscribed to.
https://www.youtube.com/feeds/videos.xml?channel_id=. You now have a list of RSS feeds of your YouTube subscriptions.
Note (2021-07-25): The script
$$("#main-link.channel-link").reduce((str, el)=>str+'\n'+el.href) no longer works. You may probably try this Python script to get a list of the channels you subscribed to. A simpler option is to export your YouTube data via Google Takeout. After extracting the generated ZIP file from Takeout, you can go to the folder
Takeout/YouTube and YouTube Music/subscriptions and there is a
subscriptions.csv file containing the list of your YouTube subscriptions.
Note (2021-12-14): Arkadij Orlov created a script to extract a list of RSS feeds of your YouTube subscriptions.