I like the idea, but I would suggest to limit the annoucement to the Guild chat, or have a setting to choose who gets notified (all, guild, friends, none)
When I post some forms or shinies I almost instantly get dms with terrible offers, new players without experience might get scammed really hard and miss out on millions.
For me its very important that the setting is either turned "off" for everyone, or turned to "friends" or "guild" before "all". I dont want new players who didnt activate this to run into this trap.
I am voting no for now, but with necessary improvement and privacy settings its a yes from me aswell.