Update: we’re live @rimworldporn
Hello, I am the founder of /r/RimWorldporn. We would like to move away from Reddit and are looking for a good alternative. We are kind of like /r/earthporn, so we require hosting of large images. We’ve been around for about 4 1/2 years and have accumulated roughly 30GB of images. The main advantage of Reddit is that it hosts relatively high quality images, for free. Would kbin be a suitable platform for this? We could host our own instance, maybe even centralize image storing on it.
The main issue seems to be your photo storage requirements. In terms of federation, your posts should appear normally for whatever platform you’re using to users who are on other instances so long as the instances don’t become defederated for some reason (a rarity in most cases unless an instance has a large number of spammers or bad users).
To answer what I think you’re asking, yes, users on other instances would see the post and would be linked to the images stored on your “home” instance in most cases.