alt Hacker News> The way trademarks work is that if you don't actively defend them you weaken your rights.
I mean this is the OP sentence, it's not about the food truck, it's about setting a precedent that you don't care, which costs you later when a competing brand starts distributing in a way that can actually confuse consumers.
Has any court ever ruled that a trademark was abandoned, merely on the grounds that its owners didn't try to prosecute a borderline infringement case?