that's why you have large lists, fallbacks and rolling updates to said fallbacks. it isolates you as the c2 owner to the c2 malware. once you have that you can just query from any kind of server and publish it anywhere else, you can have it act as an indirect proxy, not the primary contact point - it's a globally available database for a low low cost of transaction fees.

but explorers are the easiest since there's so many of them and so many of them that do not give two shits about blacklisting addresses.