This has been tried and tested multiple times with varying results, with the current iteration the Casual Horde Roleplay Discord with its weekly gatherings. Unfortunately, it’s very difficult to establish and keep a hub because the Horde is split into small pockets of communities and trying to get them all together is quite difficult. Horde is also a lot more guild-based (not REQUIRED but it helps) which also makes things hard because folks want to stick with their circles and they’re doing their own things elsewhere.
There’s an ongoing effort but it will take time.
Link to the Casual Horde Roleplaying Server thread I mentioned here.