I know it's kind of bullshit, but both CharGPT and Claude independently estimated the sum total of all DNS records is on the order of 1 or 2 TB. This is $20 of storage space today. I'm an edge case, but I can download this to my house in less than two hours. How many top level domains are changing addresses every minute?
What I don't like about DHT's is that you have to ask for everything. This means you need to be a node, or have a friendly node, in order to find things. It also creates a trail of everything that you're looking for, which makes it really easy to notice when people are looking for things that are controversial. Pushing data doesn't have this problem: yes, you need to find a source to pull from, but you can benefit from bulk optimizations. Then you can query things in zero milliseconds, and there only record is between you and your local copy.
That's real decentralization