Pool infrastructure: Relay and Cardano node hosted in Germany at 2 independent locations, on 3 different (climate-neutral operated) Hetzner Cloud Servers: Ubuntu Linux on 4-core CPU, 16 GB RAM, 160 GB SSD.
All scalable according to future technical requirements.
Important: all fees are paid out of the total amount of rewards, i.e. they are not charged per delegator! Basically, they are a kind of profit sharing — only if the pool successfully generates blocks and rewards for its delegators, the pool will receive its fees.
Thus, for climate protection, several thousand ADA are collected every year. So with your contribution (ADA delegation to CO2P) you make a good contribution to climate protection, too.