Good plugin, but lacks explanation on how to use RGB. The Discord server also seems inactive, making it hard to get support. I'm marking this plugin as working, but with missing documentation, especially for the RGB feature, which isn't even included by default in the configuration.
19:43:55 [WARNING] Error loading plugin FinestMOTD
java.lang.NoClassDefFoundError: org/bukkit/plugin/java/JavaPlugin
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at net.md_5.bungee.api.plugin.PluginClassloader.findClass(PluginClassloader.java:152)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass0(PluginClassloader.java:66)
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass(PluginClassloader.java:59)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at net.md_5.bungee.api.plugin.PluginManager.enablePlugin(PluginManager.java:341)
at net.md_5.bungee.api.plugin.PluginManager.loadPlugins(PluginManager.java:251)
at net.md_5.bungee.BungeeCord.start(BungeeCord.java:281)
at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:67)
at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15)
Caused by: java.lang.ClassNotFoundException: org.bukkit.plugin.java.JavaPlugin
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass0(PluginClassloader.java:103)
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass(PluginClassloader.java:59)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
... 13 more