I am the Head-Admin for a server and am the main person that manages the server's files. We have a hub paper server on 1.12.2, 3 paper 1.14.4 servers, and 3 servers running 1.12.2 SpongeForge that are connected via waterfall. Currently we would only be able to use Punishment gui on the paper servers but to provide some consistency, i would like to have it on all of our servers.
If this plugin does get SpongeForge support, that would be nice, but also isn't required since the commands for AdvancedBan work well.

Sponge website: https://www.spongepowered.org/
Sponge plugin documentation: https://docs.spongepowered.org/stable/en/

The following is quoted from discord:

stw222 | Zuligen head-admin
Does PunishmentGUI work with spongeforge or is it only spigot/paper? We have some paper and spongeforge servers connected together via waterfall.

CEO | Noodles
@stw222 | Zuligen head-admin you can attempt but untested

stw222 | Zuligen head-admin
FYI, PunishmentGUI doesnt seen to work with spongeforge since no config files are generated. probably because the spongeforge API is different than spigot. it was worth a try.

CEO | Noodles 🎃Today at 11:10 AM
I will look into adding support but can’t promise anything as never used that API before

stw222 | Zuligen head-adminToday at 11:17 AM
that would be great if you could support it but sadly lots of things dont because developers arent willing to support multiple apis at once

CEO | Noodles 🎃Today at 11:18 AM
Just depends how difficult it is to port, I will look into it

stw222 | Zuligen head-adminToday at 11:19 AM
apparently its simple enough. but i have no experience with it since i dont develop plugins. either use the api, or since spongeforge is basically a forge mod you could use minecraft forge if needed.