Once a company gets big enough, the quantitative difference in scale creates a qualitative difference. We don't let electricity providers deny service based on

Once a company gets big enough, the quantitative difference in scale creates a qualitative difference. We don't let electricity providers deny service based on politics; we have a whole legal class called 'public utilities' for this. Public utility laws infringe on the freedom of utility companies, anyway. The question is when a website/service should be classed a public utility.