> Does this mean someone could basically make a clone of nice hash with no accounts

Yes. I want to make it self-hostable so that anyone with an umbrel or start9 can offer a similar service to Nicehash.

It's a different architecture, though. Nicehash reroutes hashrate through a proxy. In order to "trade" hashrate you are basically redirecting the firehose in real time. This process is kind of messy and error-prone. Not very efficient. Hashpool consumes the hashrate and generates tokens that can be traded in a much more lightweight fashion. It's a much simpler and more scalable architecture that should hopefully lead to much more efficient hashrate markets.

> and potentially allow the user to select usd, btc, xmr, etc for payout?

You'll need a third party to offer money exchange services. Or you could self-host that too but I'm not aware of a software stack that can do that out of the box.

Someone should build it.