And then I think it could be very useful, if the guilds could have some type of blacklist, which is controlled by leader and other type of guild leaders, like officers or if this particular subject happens, then co-leaders too.

For my opinion and own experience, this could help bigger guilds for keeping the unwanted players out of the guild.

Example; if some player does anything that is against the guild rules; and gets kicked from the guild, that particular player couldn't be anymore possible to invite in the guild again by no-one if guild leaders could have added that particular player to the black list.

I dont know if this is possible and if it's too complicated to add for already existing guild-code.
But I thought because there is already mute-list on the friend list, then black-list shouldn't be too impossible to add for the guilds, and it could be worth of thinking throught if it's possible to add to the guild-code.

It's just an idea which I have been thinking some years now.