Although I agree in some ways, I don't think "oppress" is the correct word when companies and others are choosing not to implicitly support a particular viewpoint and exercising their own right to free speech to oppose it in an organized fashion. Oppression suggests actions more authoritarian, and targets much more vulnerable, than what we're seeing. I think it is inaccurate to say that white supremacists are being oppressed.
I think the argument would be that TDS is operating at a scale where they cannot have the same reach they do without a CDN service. So a CDN to terminating their accounts is effectively silencing them. It would be the similar if Google decided to censor their results.
