EyeOS is not explicitly disallowed, however it's guaranteed to get you suspended for the sheer amount of cpu and ram it demands to run - that'd put you on the wrong end of the High Resource Usage suspensions, which can be removed, however you'd be getting suspended pretty much every page view, so it's NOT recommended to install. You can still try it mind you, but don't be surprised if all of a sudden it gets suspended not long after starting.