I can’t figure out how to upload gifs to Lemmy…

![alt text - optional, you can keep this empty, but you need the brackets](https://website.tld/castle-nathan.gif)

Yes, there is this one for example for Linux Mobile and Desktop:

https://flathub.org/de/apps/dev.bitritter.BitRitter

They are not. They are GPL licensed.

A federated ebay is basically impossible. For that you would need real time communication between different instances. Otherwise people on the sellers instance would have an advantage in winning the auctions, defeating the purpose of making it federated in the first place.