FWIW speculation:
1) What is interesting is mineority's approach. From their website, it appears that they will be selling, maybe hosting some current generation GPU's. Their pool and some other services will be charging 0%. Also interesting is that they appear to be purchasing 2000 fpga's out of a 5000 unit order. How will they make money?
Some very rough numbers: A 100,000 sf warehouse is about $500k/year with a 3 year lease at a minimum. Additionally a warehouse has to be facilitated. So say $4 mil for the FPGA's and $1.5 mil for 3 years of a warehouse. So $5.5 mil upfront to start. If they can average $6 - $7 per day out of the FPGA's (150W ea) for a year, they will pay off the startup capital. The FPGA's will also take up very little space and cooling so they can use the rest of the warehouse as a hosting facility. By shrinking the space requirement, they can lower their risk.
2) In the give and take concerning FPGA weaknesses, from GPUhoader's succinct summary: "In general this means memory bandwidth or area heavy portions of the algorithm may be handled by the GPU, and hash algorithms designed for hardware implementations are handled by the FPGA.".
Also speculation:
Mineority charge $399 for Rx570 + 1 year of hosting. It's ~$30 USD in electricity to run it for a year at $0.03/kwh, 120W. Let's call it $50 USD to run a card all in, inclusive of wages, cooling, rent and other fixed costs divided by all GPUs.
At their scale, I assume they can get Rx570s for $150. And their cost is $150 + $50 to run it for 1 year. It's not too bad, they get 1 card free for themselves for every purchase. They get all the money upfront, no cash flow issues. They make money mining off the free gpu they get for each purchase. After some months, they pay off the facility upfront costs and stuff like mobo,psu, other pc components.
I spend an hour a week taking care of 300+ GPUs and 22 asics, almost all errors except hardware failure self recovers. They can surely do better, and 1 technician for every 10,000 GPUs should be sufficient. This is 1 salary to pay for every 10,000 gpus, 5000 which are mining for themselves.
It's only possible due to their massive scale. And if they are btc early adopters they are pretty stacked. It's all just fermi estimation, but they can do it. You won't be able to mine new coins as they pop up, but if you just don't switch coins often, mineority's package makes sense.