The goal of competition is not to become a monopoly, to win everybody over to your cause, or your product. If that is the goal, those who pursue it are of anti-social intent, and ought not to be given the means to do so. Evolution takes place when there is always a diversity of options available, and they compete on even terms. Then those options that work well will naturally be chosen, and evolution towards higher forms of life or social interaction takes place. If there is only one option available, or only very few, the system becomes stagnant, and evolution is blunted.
True competition is between options, companies, or schemes that are different.
We're not just talking about options that are the same, but that pretend to have advantages they don't have. If there is a grocery store on a street corner, and another grocer decides to open a grocery store on the other corner, in order to attract the business of the customers of the first grocery store, through better advertising, that is not necessarily useful for the community. If the second grocer truly had something different and better to offer, that might indeed by helpful. But then he wouldn't concentrate on attracting other people's business, he would concentrate on delivering what was needed and wanted. Competition on honest and even terms does not involve aggression and opposition between the different players.