it might be relevant for you if you read a lot of newsletters and find yourself at loss managing them, discovering new sources and are concerned with your email being in too many mailing lists.
If this sounds like something you'd be interested in, you can get early access by filling this short survey
https://forms.gle/ED4YJ9UCYrCHZmVZ8
More seriously, though, I don't want to "manage" newsletter subscriptions -- nor will I. If I start getting too many or they start piling up without being read or whatever, my "one neat trick" is to simply click "Unsubscribe", forget about it, and move on.