PI symbol trademarked

Good for him for getting the trademark registration. But he's gonna go broke in legal fees trying to protect it. He even needed to submit his specimen of proof twice because the USPTO stated that his first specimen was merely ornamental and that consumers would NOT identify it as a source of the goods. So it's fair to interpret that anyone who uses the mark similar to his first - and rejected - specimen, would not be infringing because consumers would not be likely to confuse the ornamental use with his brand.