FluidStack is a UK plataform that offers a software for Windows that is used for the purpose of distributing content to internet users. The idea is to operate as a cdn delivery by turning your computer into a node. You will need to register as a provider, download the software and configure your router uPnP port.
FluidStack is safe and only use your network when you are not using it. It doesn't impact performance of your computer and doesn't take huge amount of electricity resources like mining.
FluidStack pays from $5 to $50 per month to any member depending only on the up-time of the node. This company pays way more than using your computer for mining crytocurrency.
Note: You need to have access to your router admin panel and port forward your uPnP port.