Hello.
Golem is indeed one of the "Decentralized Supercomputers" project with a great potential.
The best part is, they already launched the mainnet.
I have been using it, and despite a couple of things that needs to be fixed, and tweaked, it's working wonderfully.
It is based on a reputation system, that is on the works, but after a couple of time with the Node online, you start receiving constant tasks to process.
The rewards are also payed as soon as the task is processed.
One thing that they need to tweak asap , is the possibility to use a SSD other than the one where you have the OS installed for the Docker. Many ppl nowadays possess a small SSD just for the OS, and a couple others in order to store whatever they need. The more tasks you have, the more space it will require.
For now, the computing is only done by CPU, but they are working on GPU to be released soon . :)
Have a good day.