I don't think this is some sort of centralization. In the end you always end up with some sort of a cable or router between you and the website that you want t

I don't think this is some sort of centralization. In the end you always end up with some sort of a cable or router between you and the website that you want to visit. And these companies provide you with protection of that cable / router. This opens more doors than the ones that it closes. And sure, you can just detach from CloudFlare and own your traffic, but overall the benefits of using their service are more than the downsides.