One worry arises in my head:

'Grin was launched without a premine, ICO, or founders rewards and relies on donations to support the long-term development of the project.'

So, there is a risk associated with a lack of interest at a point that could jeopardise the whole project?

What am I missing?

Also, 'early holders advantage and makes it fairer for late adopters' what I read is: 'Join later and make more' which could combat the above and maybe hope people will donate and not only profit? Greed goes a long way though