I wouldn't want to run the risk of being the first one it does happen to.
I think something like ipfs offers better resistance to such attacks for node owners. I wonder how the two compare because I don't know either in detail.
But sharing unencrypted content from others could be an issue for many reasons. Copyright too.
Especially because this protocol is aimed at content blocked or censored from other platforms, as others have pointed out.
Sure, you can block others from using your relay but then what's the point? Just host your stuff on your self hosted web blog.