At this stage, the community is so small that combining the two platforms is fine. Long-term, if we grow to hundreds or thousands of users, I'd bet at least some of them would appreciate being able to subscribe separately.
I like the idea of having the bot post the daily deals. I was idly dreaming about what it would take to have a bot repost some of the official news articles -- I know I always like to see the weekly Arena announcements -- but I don't see anything like an RSS feed on https://magic.wizards.com/en/news/archive , and I sure don't like the idea of trying to scrape the HTML, having to rework the bot every time they change the page....