DeFi was supposed to stand for "Decentralized Finance". If they can be shut down, they're not decentralized and don't deserve to use that name.
You are missing the point. It doesn't matter if they call themselves they are decentralized or not and what they deserve.
It can very easily happen that domains (and everything else recognized as their resource) are seized, which will put them in the same group as mixers.
I'm kinda expecting the long-term result to be more
real decentralization.
BitTorrent magnet links for instance don't rely on a single domain name.Mining is also supposed to be decentralized and yet, we see people closing down their farms...
Decentralized means it keeps working after someone shuts down their farm.