Who can add FPs to a Player's GB?
- Guildmates
- Friends
- Neighbors
- GB Owner
As a player you can control your friends list. If you don't want the friend to donate to your GBs just remove him/her as a friend. Probably the player would cancel the friendship first when he/she notices that he/she is forbidden to donate to your GBs. Your value as a friend is reduced if you set a rule that the friend cant donate to your GBs. I have friends that were chosen just for the objective of GB investing, I dont care if they visit my tavern or not, or how many times per week they motivate/polish at my city. If I cant invest at their GBs they will be removed from the friends list at once.
Part of the privileges of being in a guild is the ability to invest in all GBs at guild members cities. Your idea would limit that, create frictions between guildmates, and a lot of drama. As a Founder of guilds I would remove members that set such a rule, less conflicts to mediate with means a lot for Leaders and Founders.
A player cant control his/her neighbors. you may ask Support to change you to another neighborhood but I dont think "
Neighbor X donated 50 FPs to my Arc" will be considered valid a justification. The game provides the neighborhoods to allow social interaction between players, including: motivation, polishing, plundering and GB investments. You may limit plundering with Taverns Shields, but that comes with a high cost. To limit/block GB investments, if it is ever implemented, shall come with similar costs.