My suggestion is that there should be daily keys on every server or there shouldn't be daily keys at all. In my opinion it is a bit unfair that you have daily keys on skyblock and factions, but you don't have it on survival and skygrid. Which means that you have a chance to get more stuff on skyblock and factions than on survival and skygrid. Let me know what you think about it.
On skyblock the daily key is basically a 1 up of the voting key. You have a small chance to win each donation key, a chance to win ores and a chance to win money as well as tools. Plus you get prot 2 unb 2 armour , whilst the voting key is only prot 1. I don't see why this system cannot also be applied to the other servers.
You can put the same in there, but some things should get a higher percent chance of getting the item. Maybe at something else to it as well to make it more fun, like it is on skyblock and factions.
Daily crate keys are just a bonus tbh, don't think they need to implement it on all servers, it's on skyblock because the current skyblock is not the classic vanilla skyblock that we used to have. It's generally a little more op than normal skyblock, and that calls for the daily crate to be in place i think. I think its fine to just have the voting crates on the servers to increase the difficulty level of gameplay. Nice suggestion tho.
