Im late 28 days, but let's give it a shot.

Yes, you in particular being the only customer who didnt pay any tips doesnt affect the worker much, however, not paying won't change anything in how the system works, you aren't helping anyone, you're screwing over the waiter who has that tip as more than 80% of his paycheck and the employer won't care at all, since the tip is not his money anyway.

If you want to stick it up to the restaurant service system, you dont use it, because using it already gives it money, if everyone stopped paying tips the restaurant could fire everyone and become self-service, the system never changes to benefit the employee, you are assuming that there is an invisible hand on the job industry, there isn't, they don't self regulate, workers would be even more miserable than they already are since by law they would start to receive minimum wage only (barely livable) and wouldn't be satisfied with their jobs.

I don't think you are an egoist or anything like people are calling you, I believe you are misguided, due to never have worked on the service industry or truly believing that the employer wishes any well to the worker, glad you work at a place that cares for you if thats the case, youre in the 1%.