Your heart is definitely in the right place! It's a good thing to worry about and a major cause for concern. Awkwardly, the internet already has a lot of those

Your heart is definitely in the right place! It's a good thing to worry about and a major cause for concern. Awkwardly, the internet already has a lot of those. Remember when DynDNS went down under attack? A lot of websites stopped working that day. They're not the only major DNS provider, either. There are only a few certificate authorities that most commercial certs trace back to. There's a very small number of tier one ISPs. Ultimately, it's about risk and cost tradeoffs to service providers. How much risk are you comfortable with, and how much as you willing and able to spend resources to reduce? There are no easy answers here, and services that trade on economies of scale (like CDNs) will tend towards concentration.