Why Instagram works for digital products
A digital product has no stock and nothing to ship: once it exists, you can sell it as many times as you like. Instagram brings the audience and the intent. What is missing is a clean place to take the money and hand over the file. That is what your link page is for.
Instead of trading DMs to send a file after every single sale, you automate it: the buyer taps your product block, pays, and gets the download link right away.

