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That's a good point, I mean from what I gather they have reputation systems that form incentives to use it positively. I also see that it inherits a lot of Ethereum's security measures and I guess any computations done through Golem are performed on "isolated environments" and the company screens what is done quite a bit.

Those isolated environments have little access to outside networks according to the white paper:
https://golem.network/doc/Golemwhitepaper.pdf

Ah, interesting. I feel like the reputation system is always a good measure.