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.
I had no idea it was a stingray game. I thought it was only Fatshark stuck on that POS engine haha.
Things like the grenade glitch are going to be more related to th game logic than the engine, but depending on how the engine handles scripting it could be back to being an engine problem.
Overall I've never thought of Arrowhead as a 'quality' developer - I had a great time with Magicka and HD1, but the jank was part of the charm.