They send random gifts some times, usually a code to redeem something in a game I don't play.

Some super reacts - animated emojis basically.

Other than that I really couldn't tell you. I don't think the subscription is worth what the subscription gives, but the alternative is the free product gets worse faster, and that would disrupt a lot of communities that I enjoy interacting with.

Thinking of Discord as a whole, I think it is worth the nitro price. Not in love with the trajectory though.