It wouldn't be much of a problem to add it, just thinking about the code, but there are other considerations to be made here:

The cost: Our current hosting bill is relatively small and with only profile picture and header uploads it stays quite low as well. Having a lot of image uploads might cause the costs to skyrocket.

Moderation: People are horrible. That's just how it is. And if people are able to post images, they will upload the worst things possible at some point. And we want to have things prepared that people are not constantly confronted stuff they might not want to see.

We're still working on improving a lot of things to get there eventually, it just takes time, and we want to get the things right too!