Some things to note, which will probably be dealbreakers for some:
Hand-painted world which does NOT include every biome possible, just a decent spread.
Villager trading is disabled and there are no natural villages. Golem farming is disabled.
Piston farming is disabled.
End is removed, Nether is reworked, Dragon no longer bed-spammable, drops elytra and netherite and respawns on 4hour timer.
Days are 35 minutes, nights are 25 minutes
There is no teleporting, no /home, etc.
There is no Global Chat. Only local, town, nation, and alliance.
ORES now have biome-based SCARCITY. Lapis is more common in the North, Redstone in the South, Copper in the West, and Gold in the East. Unburied diamonds will now be found only in the Badlands, Mangrove, Dark Forest, and Grove biomes, located at 5 locations equidistant from spawn.
MOST OF ALL, THE SERVER IS IN BETA! There may be bugs, balancing issues, plugin configuration changes, crashes and restarts!
As far as rules go, being discriminatory, targeting and harassing other players, cheating and griefing for no reason will get you banned. PvP is allowed anywhere its turned on. Circumventing/ exploiting server oversights for gain and without reporting them will result in a ban.