Do people subscribe to this kind of thing? I saw https://www.tokendaily.co/ getting some recognition on Twitter for being a top startup but besides them, I haven't really seen any other competitors in this space.
You could try. However, why would people have any incentive to use your service to get news, when there are countless other sites like Coindesk which also have Newsletters (https://www.coindesk.com/newsletter/)?
There's definitely a lot of competition in this space than you think of, I believe. It's unlikely that without a lot of marketing, you'd be able to gain a decent size of following any time soon.
I think that there would be virtually no point in trying to repost stuff on your newsletters anyways. The only viable option imo would be to write everything OG, or employ a professional writer to do it for you. But you've got to think of how you're going to make revenue as well.