This is a rentals response because we don't know if you live in a traditionally non-tipping society or if you meant that literally, including situations where tipping is a historical part of the job and priced into the income of the labor.
But if you are in the US, that's not an ethical response. Sure, don't add a tip at the register for a random interaction that wasn't a tipped exchange a few years ago. But if you aren't tipping at restaurants, bars, and the like of traditionally tip-based services, you aren't protesting, you're just being an @*. Society has set up the economic conditions of those jobs and those transactions to be reliant on tips. Everybody involved knows it. If you want to protest that arrangement ethically, the way to do it is to abstain from engaging with those services. If you want to protest tipping of restaurant servers, don't go to restaurants that engage that traditional relationship. Using the service but then refusing to tip is just not paying for the service provided. There's a word for that.
But if you are in the US, that's not an ethical response. Sure, don't add a tip at the register for a random interaction that wasn't a tipped exchange a few years ago. But if you aren't tipping at restaurants, bars, and the like of traditionally tip-based services, you aren't protesting, you're just being an @*. Society has set up the economic conditions of those jobs and those transactions to be reliant on tips. Everybody involved knows it. If you want to protest that arrangement ethically, the way to do it is to abstain from engaging with those services. If you want to protest tipping of restaurant servers, don't go to restaurants that engage that traditional relationship. Using the service but then refusing to tip is just not paying for the service provided. There's a word for that.