What unique features does Brian D Smith highlight about using Substack for content creation?

Brian highlights several unique things about Substack for creators:

• No algorithmic gatekeeper – your work goes directly to people who chose you, via email and the app, without fighting social media algorithms.
• It is more than a newsletter – you can publish posts, podcasts, and videos, and build a community with comments, Notes, and Chats.
• Clear free/paid structure – easy to offer both free content and optional paid tiers for sustainable income.
• Better discovery and connection – followers can restack and share your work, helping you grow through genuine word of mouth, not ads.

What kind of content are you thinking about creating (writing, podcast, video, or a mix)?