If you look at DApps like Sushiswap, Pancakeswap, Curve, AAVE etc, how do you actually confirm that the web interface is hosted on Web3.0, ie a decentralized host server?
The Dapp looks indistinguishable from a regular website hosted on a single server.
a decentralized host server
Nobody is using decentralised hosting today, because it is not practical yet. Thus, any web frontend hosting is centralised by definition. Somewhere, there is a phone number and password that holds the domain name registration entry, as mainstream web browsers do not support any decentralised DNS or decentralised HTTP replacement protocol.
It is only smart contracts that are decentralised.