Is Cloudflare Ethereum's largest centralization point?

I've recently started learning about blockchain. While I understand how "anyone" can spin up a node on chains like Ethereum, that kind of decentralization feels somewhat meaningless if all (or 99.99%) network calls get relayed through several mainnet endpoints. Because of that, who owns (has the username and password) the mainnet domains, like cloudflare-eth.com and can manage their DNS records? Is this not the largest point of centralization, as well as an (or several) account owner who could take down most Dapps and network activity with a single DNS update?