To date, the vast majority of waitlist signups to Rails are individuals, not corporations.
This sets up an even better future: the commerce on Bitcoin is benefitting the individuals that create the payment infrastructure with Rails.
Discussion
Why call it yield?
Is it yield or fees?
It's revenue from providing a service, either routing or leasing revenue.
For merchants and consumers of the network, it is a fee for service.
For the provider of the Bitcoin, the service is automated and requires an amount of Bitcoin as input.
For those reasons, I think yield is the best descriptor.