You can start small; for example, make profit on traffic, processor and free disk space of your computer.
Do not switch your modem off at night, and these services will be able to sell unused Internet traffic to companies, providing VPN or CDN services. Users that need various IP addresses for business may also employ the network bandwidth.
Anyone can help science. All you need is to rent free processor powers out. The companies need them for performing complicated calculations, i.e. studying of alien life, analysis of asteroids or finding cures to serious diseases.
We pay for that we use free disc space of your devices and store files of other users on them. Join us!