My bad! I've mixed up some parts from this official blog post[0] and some talk in the community.
I thought the "What does it mean for a plugin to be Paid or have Optional Payments?" part from the FAQ was hinting towards the chance for people to sell plugins on https://community.obsidian.md/ and Obsidian itself would facilitate the transaction for a small cut at some point in the future.
I'm glad that's not the case and I apologize again for the confusion though I hope it's clear now why I believed this in the first place.