I've been working on Newsletterss, a newsletter reader for web, iOS and Android. I'm making about $2k/m with about 30% of that going to ads and infrastructure costs.
Is there a way to submit my newsletter to your database of newsletters? I run a curated gaming content newsletter(https://www.thegamingpub.com/) and being part of those databases it's what help people find my newsletter.
You can check it out at https://newsletterss.com