It is forbidden. The mods delete the links. You're basically not allowed to advertise anything that asks for money here.
Obviously not, since the link in the OP is still there.
Fundraise all you want through whatever means you want.
Please don't announce those fundraising efforts in forum posts, and please don't solicit in forum posts. (If you want to get people to donate to your efforts, you can purchase advertisement on TrekBBS.)
(Posts have now been edited judiciously throughout this thread by the Moderator.)