Cost of Farcaster sign ups once things are permissionless

Cost of Farcaster sign ups once things are permissionless 

https://warpcast.com/dwr.eth/0xd88c10

It could be nice to be able to pay via “ETH staking”. Like I’m staking 0.1eth or whatever makes sense and the service is free. Farcaster takes the money from staking. At any time I can take my ETH back and stop the service.

Definitely an opportunity for someone to build this service.

Could work that into an alETH style contract that pays off up front