Few years back I built an RSS to email service, still making ~$600/mo from it. https://www.feed2mail.com.
Later added an option to follow social feeds (Twitter, mostly) and connected the service to a Telegram bot that brings additional $100/mo.
https://t.me/Feed2Telegram_bot
It follows Twitter accounts, hashtags and search results and notifies when something new is posted.
Just send a link to the bot and it'll handle it from there. For example:
Well, I found myself flooded with feeds. That was the idea behind feed2mail - get the important stuff by mail. You are right, this is a pretty interesting reversal.
