It might be posts in your favorite subreddit, Medium articles by a certain tag or New York Times website.
Posts will be sent via chatbot in messenger (Telegram bot, Viber bot, Facebook Messenger, etc)
Will you use this service? And if "yes" — how much could you pay for a subscription?
Or, maybe, such service already exists?
I think this need is often filled by social networks (or in some more niche cases, RSS). People log onto Facebook, Twitter, etc to read updates and links from their friends, and use sites like Reddit or RSS readers to get updates in more systematic ways. For more niche topics, people subscribe to specific newsletters. I guess I'm curious what's the killer use case for this service - what's falling through the cracks? How painful is it that it's falling through the cracks?
Main use case in my opinion — is to have everything in one place. I'm using Telegram as my primary messenger and receiving all the updates from Telegram Channels. Many of my friends do the same.
Also I've encountered a problem when one of my favorite science sites disabled their RSS and I had to manually check it for updates.
The main question is — how many people would like to have latest news mixed with messages from their family members