Most of the answer to that question would come from other sources, because the issue would not be with the trust . . . it would be with other policies of security at the bank or mechanisms of security on your computer. The trust itself only authorizes the people to have access to the bank account whom you designate. If you designate no one other than yourself, then that is the way it will be. You can be the sole authorized signatory on the bank account for the trust if you wish to be. If anyone else were to access the bank account without your permission, it would not be the fault of the trust . . . it would be the fault of insufficient bank security or insufficient security on your computer, your identity, etc.
This writer has been using this type of trust since 1993 and banking with it since 1996, and so have many of our friends. We have done commerce with them, investments, business, banking, international transactions, all kinds of things. We have never had a problem with them. If they are designed and operated correctly, you will have no problem. And they have gotten better and better. The version our trust writer is providing now has improved and evolved, year after year. He keeps adding refinements, adjustments, and improvements.