>We take a 10% cut of sales made via our site (plus processing fees)

That's a very generous offer. One of the sites I use to sell my ebooks takes 20% (includes processing fees, but still higher than 10%+fees).

>We handle payments via Stripe

Does it mean payout is via Stripe too? I only have Paypal as an option.

>You can use markdown, videos, code snippets, figma embeds, CodeSandbox Embeds, and executable code snippets.

Can you import/export this as a text file? I write my ebooks in markdown, wondering if there's a way to easily adapt it.