Mastodon is almost unusably unintuitive. I don't even have something I feel like I could link to that explains how to use it. There are things that explain how it works, as jn what federation is or what decentralisation means, but there's nothing on like, how do you find good content which is actually what people using a website care about? I think that might be by design and the concept is that instead of getting good content you instead get localised content, hopefully from a high quality community. I guess the question is can you motivate people to create high quality content with distribution much smaller than what they're accustomed to? I dunno.
Anyway at worst you can use it instead of Imgur to host images to hotlink on here or whatever.